WALL — An overturned tractor trailer on the Garden State Parkway closed down the road in Monmouth County early Saturday morning.

State Police spokesman Trooper Alejandro Goez said the truck overturned about 4 a.m. onto the right lanes around south of Exit 98.

As of 8:45 a.m. only the left lane was open to traffic, creating a multi-mile delay.

Two other vehicles hit the truck as it lay on its side, according to Goez, who said the driver of a Nissan was hospitalized with serious injuries. Goez said the truck driver was sent to the hospital with minor cuts.

Goez said the accident investigation is ongoing and did not know what caused the truck to flip.