The Garden State Parkway (GSP) is a controlled-access toll road that stretches the north–south length of eastern New Jersey from the state's southernmost tip near Cape May to the New York state line at Montvale. Its name refers to New Jersey's nickname, the "Garden State". The parkway is designated by the New Jersey Department of Transportation (NJDOT) as Route 444, although this designation is unsigned. At its north end, the road becomes the Garden State Parkway Connector, a component of the New York State Thruway system that connects to the Thruway mainline in Ramapo. The parkway is the longest highway in the state at approximately , and, according to the International Bridge, Tunnel and Turnpike Association, was the busiest toll road in the United States in 2006. The highway has a posted speed limit of for most of its length, and is primarily for passenger vehicle use; trucks weighing over are prohibited north of exit 105.