sentences:  According to the NHDOT, the "length" of the traffic circle is .When it was built, the circle marked the northern terminus of the New Hampshire Turnpike, later designated as part of Interstate 95, and linked the NH Turnpike with the Spaulding Turnpike to form what the New Hampshire Department of Transportation's Bureau of Turnpikes collectively terms the "Eastern Turnpike".Although I-95 was extended north in the 1970s, bypassing the circle to cross into Maine over the Piscataqua River Bridge, that segment of I-95 is not part of the Turnpike.