About
The Mumbai Coastal Road is the largest reclamation-based urban infrastructure project ever undertaken by a city in India. Phase I connects Marine Drive (Princess Street Flyover) to the Worli end of the Bandra-Worli Sea Link, creating an 8-lane signal-free corridor along Mumbai's western seaboard.
The alignment includes a 2.07 km undersea twin-tube TBM tunnel — the first road tunnel under the sea in India — bored using a 12.19 m diameter EPB tunnel boring machine ('Mavala') through marine clay and basaltic rock. The remaining sections combine reclaimed land (~111 hectares of new coastline) and elevated viaduct.
Phase II (Versova-Bandra Sea Link) is under construction. Phase III extends to Bhayandar. When complete, the full 29 km corridor will be the longest urban coastal expressway in India.
Daily traffic in the first year averaged ~22,000 vehicles, currently free of toll. Environmental concerns over coastal disruption were litigated in the Bombay High Court and Supreme Court before final clearance in 2019.
Cross-references
10Indian 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
- India's first undersea road tunnel (2 × 2.07 km, 12.19 m diameter)
- 111 hectares of new coastline reclaimed for the road alignment
- Largest TBM ('Mavala') used in India for road work
- Eight-lane carriageway (4+4) signal-free
- Underground parking + open green space integrated above the tunnel