the Spaulding Turnpike—one in Dover and one in Rochester. Travel anywhere south of exit 6, north of exit 11, or between the barrier tolls (exits 7 through 9) is free of charge. Electronic tolling In November 2021, the New Hampshire Department of Transportation announced the installation of all-electronic tolling and collection of funds using E-ZPass transponders that are scanned by sensors for payment. Toll rates Toll rates are determined by the class of vehicle (number of axles, single or dual rear tires). The NHDOT currently offers discounted tolls for customers utilizing E-ZPass transponders registered with the agency. The discount rates are 30 percent for Class 1-4 vehicles (single rear tires) and 10 percent for Class 5-12 vehicles (dual rear tires). Exit list Sourcing for old exit numbering: Concurrent routes U.S. Route 4: , Portsmouth to Dover U.S. Route 202: , Rochester New Hampshire Route 11: , Rochester See also New Hampshire Highway System References Further reading Steve Anderson's BostonRoads.com: Spaulding Turnpike (NH 16) Toll roads in New Hampshire Two-lane freeways in the United States U.S. Route 4