Robert Moses Causeway (NY 908M (unsigned reference route)) — Accident History & Road Conditions

Real-time accident reports, live traffic conditions, and a complete safety guide to the Robert Moses Causeway, the truck-restricted Suffolk County parkway crossing the Great South Bay to Fire Island. Updated every 4 hours.

Length 5 mi
Speed Limit 50 mph
Avg Daily Traffic 25,000
Exits 4
Counties Suffolk

Route Overview

From
Southern State Parkway / Sunrise Highway (West Islip)
To
Robert Moses State Park / Fire Island (Captree State Park)
Also Known As
Robert Moses Causeway, RM Causeway, Robert Moses Parkway, Captree Causeway

About the Robert Moses Causeway

The Robert Moses Causeway — officially the unsigned reference route NY 908M and known locally as simply “the Causeway” — is the truck-restricted Suffolk County parkway that carries traffic off the Long Island mainland, across the Great South Bay, and onto the western end of Fire Island. Roughly 5 miles long, it begins near West Islip at the Southern State Parkway and Sunrise Highway (NY 27) corridor, runs south to Captree State Park on the bay, and then climbs over the high State Boat Channel bridge to Robert Moses State Park on the Atlantic barrier beach. It is the only direct vehicular route to that stretch of Fire Island, and on a hot summer Saturday it is one of the busiest recreational roads on Long Island.

Construction history

The causeway is a product of the Robert Moses parkway-building era and was constructed by the Long Island State Park Commission, the agency Moses ran for decades. The crossing opened in stages beginning in 1954, finally giving motorists a fixed connection from the mainland to the new ocean-beach state park that would later be renamed Robert Moses State Park in 1964. The northern extension, linking the bay crossing up to the Southern State Parkway and the Sunrise Highway corridor, followed in the 1960s, knitting the causeway into the larger Sunken Meadow–Sagtikos–Robert Moses parkway spine. The iconic water tower at the southern terminus, standing over the Robert Moses State Park traffic circle, remains the corridor’s most recognizable landmark and a navigational reference for generations of Long Island beachgoers.

Route geometry and the bridges

From its northern end at the Southern State Parkway and Sunrise Highway near West Islip, the causeway heads south through the mainland edge of the Town of Islip and reaches the water. The first major structure carries the road across the Great South Bay toward Captree State Park, a bay-side fishing and boating hub on Captree Island. Past Captree, the road rises onto its signature span — the tall fixed-deck bridge over the State Boat Channel — before descending onto the barrier island and looping into the Robert Moses State Park traffic circle. Because so much of the route is open water and elevated deck, the causeway has very little of the roadside development found on inland parkways; it is, functionally, a bay crossing with parkway geometry.

Jurisdiction and patrol

New York State Police Troop L holds primary patrol and investigative jurisdiction over the Robert Moses Causeway, consistent with its authority over Long Island’s other state parkways. The road is maintained by NYSDOT Region 10 and remains owned by the NYS Office of Parks, Recreation & Historic Preservation. New York State Park Police and the Suffolk County Police Department (SCPD) assist at major incidents and at the park entrances during the busy season, but they are not the primary investigative agency on the corridor. NYS Police Troop L also enforces VTL §1180-c work-zone violations, where moving-violation fines are doubled.

Speed limits and the truck ban

The posted speed limit on the causeway is generally 50 mph, with lower limits at the bridge approaches, the Captree interchange, and the Robert Moses State Park entrance. As with nearly every New York State parkway, commercial vehicles and trucks are prohibited. The recreational-parkway design, the bridge structures, and the road’s beach-access purpose make it a passenger-vehicle-only route; commercial through traffic is directed to Sunrise Highway (NY 27) instead. During strong wind events the high State Boat Channel bridge may be restricted to passenger vehicles, closed to high-profile vehicles such as campers and trailers, or shut entirely.

Dangerous Sections

The causeway’s crash and closure risk is concentrated on its bridges and its single mainland interchange rather than on a long sequence of exits. The following segments are recurring hot spots based on NYSDOT crash data, NYS Police Troop L reports, and Long Island Traffic’s running corpus of incident reports.

The State Boat Channel bridge (high span toward Robert Moses State Park): The tall fixed-deck bridge approaching the barrier island is the corridor’s most exposed point. Crosswinds off the ocean and bay buffet high-profile vehicles and motorcycles, and the grade change as the road climbs and descends the span compresses sight distance. This is the structure most likely to draw high-wind restrictions or a full closure, and the one most associated with weather-driven incidents.

The Great South Bay crossing toward Captree: The bay span carrying traffic from the mainland to Captree State Park sees heavy summer volumes feeding the fishing fleet, the boat basin, and beach-bound drivers. Stop-and-go queuing on hot weekends, combined with the open-water deck and limited shoulders, produces rear-end and sideswipe crashes that appear repeatedly in the incident feed.

The northern interchange — Southern State Parkway / Sunrise Highway (West Islip): The mainland end of the causeway concentrates merging movements among the Southern State Parkway, Sunrise Highway, and the beach-bound causeway traffic. Summer weekends produce the worst conditions, when southbound queues for Robert Moses and Captree back onto the connecting roads and create stop-and-go rear-end risk.

The Robert Moses State Park traffic circle and park interchange: At the southern terminus, the speed change from the open causeway down to the park circle and parking fields catches unfamiliar seasonal drivers. Lane-choice confusion at the field entrances and pedestrian activity near the lots raise conflict rates during peak beach hours.

Towns and Communities Along the Route

The Robert Moses Causeway is overwhelmingly a bay-and-barrier-beach crossing, so it touches few mainland communities directly. The nearest Suffolk County profiles are:

  • Bay Shore (Suffolk) — the corridor’s mainland gateway hamlet and a Fire Island ferry hub
  • Islip (Suffolk) — the Town of Islip contains the West Islip mainland approach and Captree State Park
  • Babylon (Suffolk) — the western mainland neighbor, reached via the Southern State Parkway and Sunrise Highway

Each town profile carries its own crash-frequency data, hospital and emergency-services list, and the recent accident archive filtered to that municipality.

Recent Editorial Coverage

Long Island Traffic data-desk and archive pieces that cover the Robert Moses Causeway and its corridor:

For the complete causeway accident archive, see /accidents/ and filter by road. The corpus includes a steady stream of NYS Police Troop L property-damage, personal-injury, and hit-and-run reports logged on the Robert Moses Causeway.

Accident Statistics

Robert Moses Causeway crash data are dominated by seasonal recreational patterns rather than weekday commuting. NYSDOT Motor Vehicle Crash data and NY Open Data crash records attribute the corridor’s incidents largely to summer-weekend beach traffic, weather and high-wind events on the exposed bridges, and the speed change between the open causeway and the park interchanges. Long Island Traffic’s incident feed reflects this profile: property-damage and personal-injury collisions concentrate on the bay span and the State Boat Channel bridge, with a recurring share of single-vehicle and crosswind-related events on the elevated deck. Volumes — and therefore crash exposure — spike sharply from Memorial Day through Labor Day, then fall off through the off-season when the parks are quiet.

For the most current picture of conditions on the road right now, the Live Accident & Traffic Reports section above pulls directly from 511NY and our own ingestion pipeline.

Live Accident & Traffic Reports 91 active

CLOSURE northbound

roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound area of Fire Island Inlet Bridge (Babylon) All lanes closed until 2:00 P.M.

All lanes closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Exit RM2W - NY 27A (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound Exit RM2W - NY 27A (Islip) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION both directions

Roadwork, Structure repairs on Robert Moses Causeway

Roadwork and structure repairs on Robert Moses Causeway both directions between Exit RM1E - Sunrise Highway (Islip) and Southern State Parkway (Islip), Monday June 8th, 2026 thru Friday June 12th, 2026, Monday thru Friday, 10:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION both directions

Roadwork, Structure repairs on Robert Moses Causeway

Roadwork and structure repairs on Robert Moses Causeway both directions between Ocean Parkway; Captree State Park (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip), Monday June 8th, 2026 thru Friday June 12th, 2026, Monday thru Friday, 09:00 AM thru 04:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound area of Ocean Parkway; Captree State Park (Islip) 1 Left lane of 2 lanes closed until 3:00 A.M.

1 Left lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound at Exit RM2E - NY 27A; Montauk Highway (Islip) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound at Exit RM2E - NY 27A; Montauk Highway (Islip) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Exit RM2W - NY 27A (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION both directions

Guard rail repairs on Robert Moses Causeway

Guard rail repairs on Robert Moses Causeway both directions between Exit RM1W - Sunrise Highway; NY 27 (Islip) and Southern State Parkway (Islip), Monday June 1st, 2026 thru Friday June 5th, 2026, Monday thru Friday, 10:00 AM thru 03:00 PM 1 Right lane of 3 lanes closed

No Data

CONSTRUCTION both directions

Guard rail repairs on Robert Moses Causeway

Guard rail repairs on Robert Moses Causeway both directions between START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip), Monday June 1st, 2026 thru Friday June 5th, 2026, Monday thru Friday, 09:00 AM thru 04:00 PM 1 Right lane of 3 lanes

No Data

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound between Exit RM2E - NY 27A; Montauk Highway (Islip) and Exit RM1E - Sunrise Highway (Islip) 1 Left lane of 3 lanes closed Until 3 PM

1 Left lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound Great South Bay Bridge (Islip) 1 Left lane of 2 lanes closed Until 2 PM

1 Left lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions south of Exit RM1E - Sunrise Highway (Islip) 1 Left lane of 2 lanes closed until 2:30 P.M. (at Union Blvd)

1 Left lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions between Exit RM1E - Sunrise Highway (Islip) and Exit RM2W - NY 27A (Islip) 1 Left lane of 2 lanes closed until 2:30 P.M.

1 Left lane closed

CONSTRUCTION both directions

Guard rail repairs, Roadwork on Robert Moses Causeway

Guard rail repairs and roadwork on Robert Moses Causeway both directions between Southern State Parkway (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip), Tuesday May 26th, 2026 thru Friday May 29th, 2026, Tuesday/Wednesday/Thursday/Friday, 10:00 AM thru 03:00 PM 1 Left lane of 2 lanes closed

No Data

CONSTRUCTION both directions

Guard rail repairs, Roadwork on Robert Moses Causeway

Guard rail repairs and roadwork on Robert Moses Causeway both directions between Ocean Parkway; Captree State Park (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip), Tuesday May 26th, 2026 thru Friday May 29th, 2026, Tuesday/Wednesday/Thursday/Friday, 09:00 AM thru 04:00 PM 1 Left lane of 3 lan

No Data

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound south of Exit RM1E - Sunrise Highway (Islip) 1 Left lane of 2 lanes closed until 2:30 P.M. (at Union Blvd)

1 Left lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions at Fire Island Inlet Bridge (Babylon) right shoulder closed Until 2 PM

right shoulder closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Exit RM1E - Sunrise Highway (Islip) and Exit RM2E - NY 27A; Montauk Highway (Islip) 1 Left lane of 2 lanes closed Until 3 PM

1 Left lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) right shoulder blocked until 3:00 P.M.

right shoulder blocked

CONSTRUCTION both directions

Barrier repairs, Bridge rehabilitation, Guard rail repairs, Roadwork on Robert Moses Causeway

Barrier repairs and bridge rehabilitation and guard rail repairs and roadwork on Robert Moses Causeway both directions between Exit RM1E - Sunrise Highway (Islip) and Ocean Parkway; Captree State Park (Islip) Not currently Scheduled

No Data

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions between Exit RM2W - NY 27A (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip) 1 Left lane of 2 lanes closed until 3:00 P.M.

1 Left lane closed

CONSTRUCTION both directions

Barrier repairs, Guard rail repairs, Roadwork on Robert Moses Causeway

Barrier repairs and guard rail repairs and roadwork on Robert Moses Causeway both directions between Southern State Parkway (Islip) and Exit RM1W - Sunrise Highway; NY 27 (Islip), Monday May 11th, 2026 thru Friday May 15th, 2026, Monday thru Friday, 10:00 AM thru 03:00 PM 1 Left lane of 2 lanes clos

No Data

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Exit RM1E - Sunrise Highway (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions at Exit RM2E - NY 27A; Montauk Highway (Islip) 1 Left lane of 3 lanes closed Until 3 PM

1 Left lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway both directions at Exit RM2E - NY 27A; Montauk Highway (Islip) 1 Left lane of 3 lanes closed until 3:00 P.M.

1 Left lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Captree Drawbridge (Babylon,Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Ocean Parkway; Captree State Park (Islip) and Fire Island Inlet Bridge (Babylon) 1 Left lane of 2 lanes closed until 3:00 P.M.

1 Left lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound Exit RM2E - NY 27A; Montauk Highway (Islip) to Great South Bay Bridge (Islip) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound between Captree Drawbridge (Islip) and Great South Bay Bridge (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound area of Ocean Parkway; Captree State Park (Islip) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound area of Great South Bay Bridge (Islip), Wednesday April 29th, 2026 thru Thursday April 30th, 2026, Wednesday/Thursday, 09:00 AM thru 12:30 PM 2 lanes of 4 lanes closed

No Data

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway both directions between Exit RM1W - Sunrise Highway; NY 27 (Islip) and Exit RM2W - NY 27A (Islip), Sunday April 26th, 2026 thru Friday May 1st, 2026, Sunday/Monday/Tuesday/Wednesday/Thursday/Friday, 09:00 AM thru 04:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway both directions at CAPTREE IS (Babylon), Monday April 27th, 2026 thru Friday May 1st, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway both directions between Exit RM2W - NY 27A (Islip) and ROBERT MOSES CSWY at Ocean Parkway (Babylon), Monday April 27th, 2026 thru Friday May 1st, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound between START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) and Captree Drawbridge (Islip) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) All lanes open alternating lane closures until 3:00 P.M.

All lanes open

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 2 lanes closed until 2:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 2 lanes closed from 10:00 A.M. until 2:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M. (Robert Moses State Pkwy Westbound between Coast Guard Station and RMC)

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Great South Bay Bridge (Islip) and Ocean Parkway; Captree State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 2:00 P.M.

1 Right lane closed

CONSTRUCTION eastbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway eastbound between Robert Moses State Park (Islip) and Coast Guard Station (Islip) right shoulder closed until 3 pm

right shoulder closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 2 lanes closed from 10:00 A.M. until 2:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Ocean Parkway; Captree State Park (Islip) right shoulder blocked until 3:00 P.M.

right shoulder blocked

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Ocean Parkway; Captree State Park (Islip) and START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) right shoulder closed Until 3 PM

right shoulder closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound between Captree Drawbridge (Islip) and Ocean Parkway; Captree State Park (Islip), Monday April 20th, 2026, 09:00 AM thru 12:30 PM 1 Right lane of 2 lanes closed

No Data

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound ramp from Southern State Parkway (Islip) right shoulder blocked until 3:00 P.M.

right shoulder blocked

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound between START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) and Ocean Parkway; Captree State Park (Islip) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway at Captree Island (Babylon), Monday April 13th, 2026 thru Friday April 17th, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway both directions between Exit RM2E - NY 27A; Montauk Highway (Islip) and OCEAN PKWY (Babylon), Monday April 13th, 2026 thru Friday April 17th, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound south of Exit RM1E - Sunrise Highway (Islip) 1 Right lane of 2 lanes closed until 2:00 P.M. (at Union Blvd)

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Captree Drawbridge (Babylon,Islip) and Ocean Parkway; Captree State Park (Islip) 1 Right lane of 2 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed between 10:00 A.M. and 2:00 P. M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound at Exit RM2W - NY 27A (Islip) 1 Right lane of 3 lanes closed and exit ramp closed until 3:00 A.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Captree Drawbridge (Babylon,Islip) and Ocean Parkway; Captree State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound Exit ramp Exit RM2W - NY 27A (Islip) 1 Right lane of 3 lanes closed

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound area of Ocean Parkway; Captree State Park (Islip) 1 Left lane of 2 lanes closed until 3:00 P.M.

1 Left lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound between Ocean Parkway; Captree State Park (Islip) and Captree Drawbridge (Islip) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound Fire Island Inlet Bridge (Babylon) 1 Right lane of 2 lanes closed (alternating lane closures) until 2:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound area of Ocean Parkway; Captree State Park (Islip) 1 Left lane of 3 lanes closed Until 3 PM

1 Left lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Captree Drawbridge (Babylon,Islip) and Ocean Parkway; Captree State Park (Islip) 1 Right lane of 2 lanes closed Until 3PM

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound ramp to Southern State Parkway (Islip) 1 Right lane of 2 lanes closed until 2:30 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound between START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) and Ocean Parkway; Captree State Park (Islip) All lanes open One lane closed Until 3 PM

All lanes open

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Captree Drawbridge (Babylon,Islip) 1 Left lane of 2 lanes closed until 3:00 P.M.

1 Left lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at Ocean Parkway; Captree State Park (Islip) right shoulder blocked until 3:00 P.M.

right shoulder blocked

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Ocean Parkway; Captree State Park (Islip) and START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound at START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway ramp southbound at Ocean Parkway; Captree State Park (Islip) 1 Right lane of 2 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway southbound between Captree Drawbridge (Babylon,Islip) and Ocean Parkway (Islip) 1 Right lane of 3 lanes closed Until 3 PM

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at Ocean Parkway; Captree State Park (Islip) All lanes open exit ramp lane partially blocked

All lanes open

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound area of Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound between Ocean Parkway; Captree State Park (Islip) and START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) 1 Right lane of 2 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION both directions

Guard rail repairs, Roadwork on Robert Moses Causeway

Guard rail repairs and roadwork on Robert Moses Causeway both directions at Captree Island (Babylon,Islip), Monday March 30th, 2026 thru Friday April 3rd, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Right lane of 2 lanes closed

No Data

CONSTRUCTION both directions

Guard rail repairs, Roadwork on Robert Moses Causeway

Guard rail repairs and roadwork on Robert Moses Causeway both directions between Exit RM2W - NY 27A (Islip) and Ocean Parkway; Captree State Park (Islip), Monday March 30th, 2026 thru Friday April 3rd, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Right lane of 2 lanes closed

No Data

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway northbound between Ocean Parkway; Captree State Park (Islip) and Captree Drawbridge (Islip) All lanes shift until 3:00 P.M.

All lanes shift

CONSTRUCTION northbound

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway northbound between Ocean Parkway (Islip) and Captree Drawbridge (Islip) 1 Right lane and shoulder of 2 lanes closed until 3:00 P.M.

1 Right lane and shoulder closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound area of Fire Island Inlet Bridge (Babylon) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION southbound

Roadwork on Robert Moses Causeway

Roadwork, roadwork on Robert Moses Causeway southbound at START ROUTE Robert Moses Causeway; Robert Moses State Park (Islip) 1 Right lane of 3 lanes closed until 3:00 P.M.

1 Right lane closed

CONSTRUCTION both directions

Roadwork on Robert Moses Causeway

Roadwork on Robert Moses Causeway both directions between Exit RM2W - NY 27A (Islip) and OCEAN PKWY (Babylon), Monday March 23rd, 2026 thru Friday March 27th, 2026, Monday thru Friday, 09:00 AM thru 03:00 PM 1 Left lane of 3 lanes closed

No Data

Data from 511NY, updated Jun 10, 8:01 AM

Recent Incidents

No reported incidents on this road yet. See all Long Island accidents.

Accident Statistics

No accident data yet for this road.

Dangerous Sections

  • RM2
  • RM1

Towns Along This Route

Frequently Asked Questions

What happened on the Robert Moses Causeway today?

Check the Live Accident & Traffic Reports section above for the latest Robert Moses Causeway incidents. Long Island Traffic ingests data from 511NY, NYS Police Troop L, and SCPD every 15 minutes; static-page coverage rebuilds every 4 hours. For the most recent 30-minute window, 511ny.org is the upstream source.

How long is the Robert Moses Causeway?

The Robert Moses Causeway is roughly 5 miles long. It runs south from the Southern State Parkway and Sunrise Highway corridor near West Islip, across the Great South Bay via Captree State Park, and over the high State Boat Channel bridge to Robert Moses State Park on the western end of Fire Island. It is the only direct vehicular route to that section of the barrier beach.

Are trucks allowed on the Robert Moses Causeway?

No. Like nearly every New York State parkway, the Robert Moses Causeway prohibits commercial vehicles and trucks. The recreational-parkway design, the bridge structures, and the seasonal beach mission make it a passenger-vehicle-only road. Trucks attempting to use it face citations from NYS Police Troop L, and commercial traffic is directed to Sunrise Highway (NY 27) instead.

Why does the Robert Moses Causeway close in high winds?

The causeway's tall fixed-span bridge over the State Boat Channel sits high above the water on an exposed barrier-island crossing, where there is little to break the wind off the Atlantic and Great South Bay. During strong wind events, NYSDOT and NYS Police Troop L may restrict the bridge to passenger vehicles, ban high-profile vehicles such as campers and trailers, or close the span entirely. Crosswinds are also a recurring hazard for motorcycles and light vehicles on the elevated deck.

What are the most dangerous sections of the Robert Moses Causeway?

The high bridge spans are the corridor's signature risk: the Great South Bay crossing toward Captree and the elevated State Boat Channel bridge approaching Robert Moses State Park both expose drivers to crosswinds, merging traffic, and the speed change between the open causeway and the park interchanges. The northern interchange with the Southern State Parkway and Sunrise Highway near West Islip also concentrates crashes, especially during summer beach-season queuing.

What is the speed limit on the Robert Moses Causeway?

The posted speed limit on the Robert Moses Causeway is generally 50 mph, dropping at the bridge approaches, the Captree interchange, and the Robert Moses State Park entrance. Lower limits apply in posted work zones, where New York's work-zone moving-violation fines double under VTL §1180-c. Advisory speeds on the interchange ramps run well below the mainline limit.

Who patrols the Robert Moses Causeway?

New York State Police Troop L has primary patrol and investigative jurisdiction for the Robert Moses Causeway, as it does for the other Long Island state parkways. The road is maintained by NYSDOT Region 10 and remains under the ownership of the NYS Office of Parks, Recreation & Historic Preservation. The Suffolk County Police Department (SCPD) and New York State Park Police assist at major incidents but are not the primary investigative agency on the corridor.

Does the Robert Moses Causeway go to Fire Island?

Yes. The Robert Moses Causeway is the only road that carries vehicles directly to the western end of Fire Island, terminating at Robert Moses State Park. From there visitors can reach the Fire Island Lighthouse on foot and connect to the car-free communities farther east. The causeway also serves Captree State Park, a fishing and boating hub on the bay side, along the way.

Is the Robert Moses Causeway a toll road?

No. The causeway itself is toll-free. Robert Moses State Park and Captree State Park charge a seasonal vehicle-use (parking) fee at the park entrances during the summer season, but there is no toll to drive the causeway or cross its bridges. The Empire Pass annual permit covers the park entry fee at both state parks.

How does the Robert Moses Causeway connect to the rest of the parkway system?

At its northern end the causeway meets the Southern State Parkway and the Sunrise Highway (NY 27) corridor near West Islip. The continuous controlled-access route north of there carries on as the Sagtikos State Parkway to the Long Island Expressway and then the Sunken Meadow State Parkway to the North Shore — meaning the Sunken Meadow–Sagtikos–Robert Moses corridor together forms the only fully limited-access north-south crossing of Suffolk County, from the Long Island Sound beaches to the Atlantic barrier beaches.

Injured in a Robert Moses Causeway Accident?

Sources