The New Jersey Turnpike, Troop D, is the nation's busiest limited access non-stop toll road, consisting of 148 miles. Incorporating areas of four to twelve lanes, it is 1,194 lane-miles long. Troop D Headquarters and Cranbury Sub-Station are located between Interchanges 8 and 8A at Milepost 71.5 in Cranbury Township. Other Turnpike stations are located at Moorestown and Newark. Each station patrols approximately one third of the 148 mile roadway network.

Virtually all highway traffic between the great seaports of New York and Philadelphia passes through New Jersey. In spite of this incredible volume of traffic, the New Jersey Turnpike has consistently been one of the safest major toll roads in the United States.

As a result of enforcement efforts using a variety of enforcement strategies and techniques designed to reduce accidents and increase motorist compliance with traffic laws, Troop D experienced a decrease in motor vehicle accidents.

Because of the easy accessibility to the Turnpike and the Turnpike's direct connection between major metropolitan areas, the type of criminal activity Troop D personnel confronted on a daily basis was no different than that of any large city.

As of July 1, 1992, the New Jersey Turnpike acquired four miles of I-95, Milepost 118 to Milepost 122. This short Section of highway is the key link between the George Washington Bridge, I-80 and the New Jersey Turnpike. The State Police and the New Jersey Turnpike Authority have worked vigorously to reduce the accident rate on the four mile stretch by strict enforcement and numerous construction projects to meet turnpike standards.

Troop D Headquarters and Cranbury Station have been operational since 1995.

In July 2000 Troopers trained as Emergency Medical Technicians (E.M.T.) began patrolling the Turnpike as part of an initiative whose purpose was to confront the challenge of bringing advanced medical care to the patrons of this limited-access highway in a timely fashion.