Roadway Information and Traffic Monitoring System Program
Public Roadway Mileage and Vehicle Miles Traveled
Public roadway mileage figures are maintained by NJDOT through road inventories. A public road is any road or street owned and
maintained by a public authority and open to public travel. New Jersey has approximately 39,000 miles of public roadways. New
Jersey's official estimate of vehicle miles traveled (VMT) is a product of the Highway Performance Monitoring System (HPMS)
Program. VMT is a measurement of the amount of traffic on a given mile of roadway. Deriving New Jersey's VMT estimate involves
multiplying the traffic volume on each HPMS section, the section length and expansion factor then summing the product to yield
VMT for any desired aggregation level.
For further information, you may call the NJDOT Bureau of Transportation Data and Development at (609)530-3503.
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state Adobe access page.