The New Jersey Department of Transportation (NJDOT) operates three divisions in the state: North, South, and Central, which encompasses Hunterdon, Mercer, Middlesex, Monmouth, Ocean, and Somerset counties and portions of Warren County. (Routes 22, 122, 173, 78 and including south of Route 57). Apart from Mercer County, which comes under the auspices of the Delaware Valley Regional Planning Commission, all counties in the region are part of the North Jersey Transportation Planning Authority, a government partner which approves transportation projects for the state.