Mount Washington Auto Road

The Mount Washington Auto Road — originally the Mount Washington Carriage Road — is a 7.6 mi toll road that extends from New Hampshire Route 16 in Green's Grant, just north of Pinkham Notch, westward across Pinkham's Grant and Thompson and Meserve's Purchase to the summit of Mount Washington in the White Mountains of the US state of New Hampshire. The road climbs 4,618 ft from an altitude of 1,527 ft at the bottom to 6,145 ft at the top, an average gradient of 11.6%. The road was completed and opened to the public in 1861.
The Auto Road may be traversed by private vehicles, and there are also guided tours in vans, called stages. The toll on private cars includes a bumper sticker with the text, "THIS CAR CLIMBED MT. WASHINGTON". No bicycles are allowed on the road, except for participants during specific bicycle events .

Wikipedia