About
Atal Setu (officially the Mumbai Trans Harbour Link) is the longest sea bridge in India and the 12th longest sea bridge in the world. The crossing slashes Mumbai-Navi Mumbai travel from ~2 hours through ground traffic to ~20 minutes, decongesting the eastern freeway and ramping access to JNPT and the upcoming Navi Mumbai International Airport.
The alignment combines 16.5 km over the Arabian Sea with 5.5 km on land, executed in three packages by L&T, Tata Projects + Daewoo, and an L&T + IHI joint venture. The navigation channel section uses orthotropic steel box girders with a 180 m main span — engineered for the seismic zone III + cyclone wind exposure of the Mumbai coast.
The project is a flagship of MMRDA's eastern waterfront strategy, financed through a JICA loan plus state contributions, with a 30-year toll concession.
Cross-references
12Indian Standards, IRC codes, and InfraLens knowledge articles that bear on this project's design and execution. Each link opens the relevant reference page.
Notable features
- 180 m main navigation span over Thane Creek for ship clearance
- Six-lane carriageway (3+3) plus emergency exit lanes
- Reverse Bus Bay system for emergency stopping
- Open Road Tolling — no toll plazas mid-bridge
- Average daily traffic ~50,000 vehicles in the first year