Tail of the Dragon (US-129)

318 curves in 11 miles along the NC/TN border — one of the most famous motorcycle and sports-car roads in the country.

Length

11 mi

Sinuosity

2.8x

Turns/mile

Elevation gain

900 ft

Good to know

Best season: Late spring through fall
Typical speed limit: 30 mph
Surface: Well-maintained two-lane asphalt, no guardrails on many curves.

Source

318-curves-in-11-miles is the road's own widely-cited, verifiable statistic. Turns/mile derived from it; sinuosity is a reasonable estimate pending OSM geometry.