The 401 westbound lanes near Duart Road are open again after two tractor-trailers collided early this morning.
Police say about 3:45 a.m., one big rig rear-ended another.
Chatham-Kent OPP say their investigation indicates the lead truck slowed for a construction zone and was subsequently struck from behind.
No one was injured and charges are pending, police say.
The highway was closed for several hours this morning.