Long Island Expressway (I-495) accidents in Ronkonkoma, NY

What our records show

The Long Island Expressway (I-495) runs through Ronkonkoma as one of the 66-mile primary expressways serving Suffolk County, carrying roughly 200,000 vehicles per day. The posted speed limit is 55 mph (50 mph in Queens). The route stretches from Queens Midtown Tunnel (Manhattan) to County Route 58 (CR 58), Calverton / Riverhead (Suffolk County), with Ronkonkoma sitting along that spine. Locally, drivers know it as LIE or The Expressway or Interstate 495 or I-495.

Our database has logged 5 incidents on Long Island Expressway within Ronkonkoma, including 4 critical, 1 major cases. No fatalities have been recorded in the incidents we track for this stretch. The most recent report we published involved Motorcyclist Seriously Injured After Crossing Double Yellow Line Crash In Ronkonkoma on April 11, 2026. On average, we've seen roughly 0.1 reported crashes per month on this stretch during the period covered by our archive.

Inside Ronkonkoma, Long Island Expressway intersects with or runs parallel to several other high-volume routes — Veterans Memorial Highway, Portion Road — so many crashes on this corridor originate at exits and interchanges rather than along open stretches. That pattern matches what we see in the incident reports below, which cluster around entry and exit ramps feeding those surface streets.

Town context matters because accidents here don't unfold in isolation. Ronkonkoma is home to about 19,000 residents . Below you'll find every incident on this stretch we've covered, newest first.