Going-to-the-Sun Road

50 miles across the Continental Divide through Glacier National Park — hairpin switchbacks up Logan Pass, seasonal (typically open only late June-October).

Length

50 mi

Sinuosity

1.7x

Elevation gain

3,400 ft

Good to know

Best season: July-September only (seasonal closure)
Typical speed limit: 25 mph
Surface: Narrow, no guardrails on many sections, vehicle length restrictions.

Source

Real NPS road; well documented seasonal closure and length. Sinuosity is a reasonable estimate.