Route 12 is shut down in the area of Route 2A in Preston due to a tractor-trailer crash, according to police.
The tractor-trailer rolled over around 2 p.m. Wednesday afternoon, closing the road.
Traffic from Route 12 northbound is being diverted to Route 214 eastbound in Ledyard. Traffic on the southbound side is being diverted onto Route 2 at the intersection of Route 2A eastbound. Traffic onto Route 2A from Interstate 395 is being diverted onto exit 2 for Mohegan Sun Boulevard, according to state police.
Police said the road will remain closed until at least midnight.
It's not clear if anyone was injured in the crash.
Check back for updates.