A tractor-trailer flipped on its side and its driver was trapped inside at the Allentown service plaza of Pennsylvania Turnpike late Friday afternoon.

The truck was on the northbound ramp leading into the service plaza.

The northbound entrance to the service plaza was closed for about an hour.

At 5:30 p.m. Friday, a turnpike spokeswoman said the entrance had reopened.

She said the unidentified driver had been removed from the cab and was taken to a hospital, but did not know how seriously he was injured.

The truck had been set back up and a small amount of fuel was cleaned up.