Overseas Highway (US-1 Florida Keys)

113 miles of US-1 island-hopping to Key West over 42 bridges, including the 7-mile bridge — flat and straight, but a genuinely unique drive over open ocean.

Length

113 mi

Sinuosity

1.1x

Turns/mile

Elevation gain

50 ft

Good to know

Best season: Winter and spring (less hurricane risk)
Typical speed limit: 55 mph
Surface: Well maintained, can be heavily trafficked especially near Key Largo.

Source

Real, well-documented highway with 42 bridges — length and bridge count are widely cited facts. Sinuosity/turns-per-mile computed from actual OSRM route geometry (matched within 12% of curated length) — confirms it's the flattest/straightest road in this set, as expected for an island-hopping causeway.