The state DOT says two lanes are closed on Interstate 95 in Stamford between exits 6 and 7 northbound because of a rollover crash.
Only the left lane is open.
It was not immediately known if anyone was hurt in the crash. Two ambulances were dispatched to the scene, along with state police and Stamford fire.
The accident is causing delays from the New York state line to exit 6, the DOT says.