Surviving the Oakdale Merge

The Problem

There’s a stretch of Sunrise Highway between CR 93 (East Patchogue) and Lakeland Avenue (Bohemia/Sayville) where the road undergoes a personality change. West of this zone, Sunrise is a regular surface highway with traffic lights, turning lanes, and strip malls. East of it, Sunrise becomes a limited-access expressway — no lights, no crossroads, 55 MPH.

The transition between these two road types creates one of Suffolk County’s most hated bottlenecks. Traffic from the signalized section, traffic from Montauk Highway (Route 27A) merging via service roads, and traffic from local streets in Oakdale and Bohemia all converge into the expressway’s two lanes in each direction. The result is a funnel effect where approximately 126,000 vehicles per day try to squeeze through a space designed for far fewer.

Eastbound, the backup starts at the last traffic signal before the expressway section and can stretch west for two miles. Westbound, traffic exiting the expressway stacks up as it hits the first signals. Both directions are miserable during rush hour, and on summer weekends, the eastbound jam is apocalyptic as beach and Hamptons traffic piles in.

The Shortcut

There’s no bypass that completely avoids this zone — it’s a geographic chokepoint. But there are strategies that can save real time.

Eastbound Strategy

1. Commit to your lane early. The right lane feeds the service road / Montauk Highway. The left lane feeds the expressway. If you want the expressway, be in the left lane before the Oakdale LIRR station overpass.
2. The key intersection is Sunrise Highway and Lakeland Avenue. This is the last signalized intersection before the expressway begins. If you’re in the left lane approaching this light, you’ll flow directly onto the expressway.
3. Bail to Montauk Highway early if the expressway merge is backed up. Rather than sitting in the left-lane queue, take Montauk Highway (Route 27A) east from the Oakdale area. Montauk runs parallel to Sunrise about a half-mile south. It has lights and is slower, but when the Sunrise merge is backed up 15+ minutes, Montauk’s steady 25-30 MPH beats sitting still.
4. Re-enter Sunrise Highway east of the merge via the Connetquot State Park area or at the William Floyd Parkway (CR 46) interchange, where on-ramps are less congested.

Westbound Strategy

1. Stay right approaching the expressway terminus. The left lane funnels into Sunrise’s surface-road section. The right lane offers the option to exit onto the service road, which connects to Montauk Highway.
2. If the surface section is backed up (visible brake lights at the first signal), take the service road right and use Montauk Highway westbound. Montauk through Oakdale and West Sayville has fewer lights than Sunrise’s commercial stretch and moves more consistently.
3. Key westbound decision point: the Connetquot River bridge. If traffic is flowing on the expressway but you can see red brake lights ahead as the expressway ends, start moving right to take the service road exit before you’re locked into the backup.

The Montauk Highway Escape Route

Montauk Highway (Route 27A) runs parallel to Sunrise through Oakdale, West Sayville, and Bayport. It’s a two-lane road through residential areas with 30 MPH limits — not fast, but consistent. When the Sunrise merge is adding 15+ minutes to your trip, Montauk saves time simply by moving.

Access Montauk Highway from Sunrise via:

• Lakeland Avenue south (at the Oakdale merge)
• Idle Hour Boulevard (just west of the merge zone)
• Johnson Avenue (in Sayville, west of the merge)

When to Use It

• Weekday PM rush, eastbound (4:00-6:30 PM). Commuters heading home to East Islip, Bayport, Blue Point, and beyond stack up at the merge every day.
• Friday PM eastbound (2:00-7:00 PM). Weekend beach and Hamptons traffic compounds the regular commute. The backup can start at CR 85 (Waverly Avenue in Patchogue) — that’s three miles west of the actual merge.
• Summer Saturday mornings, eastbound. Beach traffic heading to Smith Point, Cupsogue, or the Hamptons hits this merge hard from 8-11 AM.
• Any day there’s an accident between the Oakdale merge and William Floyd Parkway. With only two lanes and no shoulder on the Sunrise expressway section, any incident backs traffic into the merge zone instantly.

When NOT to Use It

• Off-peak hours. After 7 PM or before 6:30 AM, the merge flows freely. No need to detour to Montauk Highway.
• Short local trips within Oakdale/Sayville. If you’re just going a mile or two, surface streets serve you better than trying to engage the expressway merge.
• When Montauk Highway itself is congested — which happens during school drop-off/pickup times (7:30-8:15 AM, 2:30-3:15 PM) near Oakdale-Bohemia schools. Check before bailing to Montauk.
• Rainy conditions. The Montauk Highway escape route goes through residential areas with poor drainage. Flooding near the Connetquot River crossing is common during heavy rain, and the road can be reduced to one lane.

Time Savings

Normal PM rush eastbound: 5-10 minutes saved by using the Montauk Highway bypass when the merge is backed up past Lakeland Avenue.

Friday PM or summer weekend: 10-15 minutes saved. The merge backup stretches much further, and the time penalty for sitting in it is severe. Bailing early to Montauk and re-entering east of the merge is consistently faster.

Accident on Sunrise expressway east of merge: 15-20+ minutes saved. When the expressway is fully blocked, the merge zone becomes a parking lot. Montauk Highway becomes the only viable route.

Correct lane positioning without detour: 5-7 minutes saved. Even if you don’t bail to Montauk, being in the correct lane approaching the merge avoids last-minute lane changes that add multiple light cycles of delay.

Pro Tips

• The Oakdale LIRR station parking lot fills up by 7:30 AM, and the overflow traffic clogs Oakdale-Bohemia Road, which feeds into the Sunrise merge zone. If you’re passing through this area between 7-8 AM, expect pedestrians and double-parked cars near the station.
• Connetquot River State Park is your landmark. The merge zone ends just west of the park. If you can see the park’s tree line ahead, you’re almost through.
• The speed limit drops to 40 MPH in the merge transition zone but nobody does 40. The actual flow is 25-35 during rush and 45-50 off-peak. Match traffic speed, not the posted limit, for safety.
• Suffolk County traffic cameras cover this intersection cluster. Check SuffolkCounty.gov traffic cameras to see real-time conditions before you reach the zone.
• If you’re a regular on this stretch, time your departure. The eastbound merge backup dissipates quickly after 6:30 PM on weekdays. Leaving work 20 minutes later can save you 15 minutes of sitting in the merge. The math works out — you arrive at the same time with less stress.
• The Sayville Diner on Montauk Highway is right in the middle of the bypass route. If traffic is truly terrible, stop for coffee and wait 20 minutes. You’ll arrive at the same time as if you’d sat in the merge, but with better coffee and lower blood pressure.