Tractor-trailer hauling mail crashes on I-95 in Upper Chichester, Pa.

UPPER CHICHESTER, Pa. (WPVI) -- A tractor-trailer crash slowed traffic on I-95 South near the Pennsylvania-Delaware state line overnight.

The big rig was hauling mail and ran off the southbound lanes in Lower Chichester, Pa. at 12:30 a.m. Sunday.

The cab of the truck ended up stuck in some trees.

Pennsylvania State Police blocked one of two southbound lanes as crews worked to free the truck.

All lanes were back open by 6:00 a.m.

There were no immediate reports of injuries, or what caused the driver the lose control.