A person trapped under a vehicle led to the closure of northbound Interstate 95 in Westport for several hours on Saturday, officials said. Traffic was being detoured off the highway at Exit 18. All northbound lanes reopened around 12:45 p.m. Westport Assistant Fire Chief Matthew Cohen said a person was pinned under a vehicle following a 9 a.m. two-vehicle accident. \u201cUnits arrived on scene and found a two vehicle crash with one person requiring extrication from under one of the vehicles. It is believed that the trapped individual was outside of the vehicle in the breakdown lane checking on a mechanical issue when their vehicle was struck. \u201cFairfield Fire and AMR responded as well. Westport firefighters used hydraulic rescue tools to lift the vehicle enough to remove the injured party. The party was turned over to Westport EMS for treatment and transport to the hospital. An additional person was treated and transported from the scene. The patient sustained severe injuries; specifics are not being released at this time.\u201d The highway was closed for hours between exits 18 and 19, causing heavy northbound delays. Traffic speeds were just 5 mph between Norwalk and Bridgeport, according to the state Department of Transportation. Just after 12:30 p.m. it was tracking 190 minutes to travel 15 miles on northbound I-95. Drivers seeking alternative routes have clogged Route 1 in Norwalk, Westport and Fairfield. Northbound traffic was also slow on the Merritt Parkway with average speeds of 25 mph.