The crash occurred south of Route 111 in Trumbull around 3:40 p.m.
Roughly two hours later, there were reports of stop and go traffic, causing delays up to half an hour, on Route 25 north.
Just before 6 p.m., state police shut down the highway’s northbound lanes at Exit 9. That closure lasted nearly three hours as crews worked to clear the scene, reopening around 9 p.m
Tara O’Neill contributed to this report.