Researched
Motorways & Interstates
Roads without crossings, built for cars only, start with Italy's autostrada (1924) and Germany's Cologne-Bonn road (1932) and grow into the US Interstates.
Open in the interactive tree →Grade-separated motorways allow fast, safe, long-distance car and truck travel. They shaped suburbs and logistics in the twentieth century.
Prerequisites
Sources
More in Transport & Mobility · Machine Age
- Airplane1903
- Gyrocompass & Autopilot1908
- Pallet & Forklift1917-1945
- Helicopter1936-1942
- Turbojet Engine1937