Both lanes of eastbound Interstate 70 west of Clear Spring remain closed after a fire in a tractor-trailer carrying blasting devices, the Maryland State Highway Administration said.
The agency is assessing the extent of any asphalt damage from the fire, spokesman David Buck said Friday.
Authorities are diverting eastbound traffic onto U.S. 40 at exit 12 to avoid a 6-mile stretch of I-70, Buck said.
There was no explosion, according to Maryland State Police. Firefighters let the flames burn out and then used water to cool the smoldering remains.
The fire apparently started in the brakes of the eastbound truck, First Sgt. Kevin Lewis said.
The driver managed to separate the truck from the trailer and drive away from the blaze, Lewis said.