Drivers in Frederick, Maryland, were told to expect major delays after a tractor-trailer accident Tuesday morning.
The crash happened in the northbound lanes of Route 15 near 7th Street. Just one northbound lane of Route 15 is open, and 7th Street is closed in both directions at the Route 15 ramps, Frederick Police said on Twitter.
Drivers were told to avoid Route 15 at 7th Street, Route 40, Jefferson Street and Rosemont Avenue.
Market and East streets are also experiencing heavy traffic, Frederick Police said.
Authorities have not yet provided further details of the crash.
Maryland State Police are investigating.