A vehicle rolled over on Route 15, near exit 60, Thursday morning.
State police said the left lane was shut down at exit 60 in Hamden and the CTRoads.org website said the left lane was closed on both the northbound and southbound sides between exits 59 and 60, in Woodbridge.
State police urged drivers to seek alternate routes and plan for traffic delays, but the scene has since cleared.
Get top local stories in Connecticut delivered to you every morning. Sign up for NBC Connecticut's News Headlines newsletter.
Sign up for our Breaking newsletter to get the most urgent news stories in your inbox.