Mahim Causeway was the only road connecting the western suburbs to Mumbai's central business district. This north-southwestern corridor became a bottleneck and was highly congested.
BWSL was designed as the first cable-stayed bridge to be constructed in open seas in India. Due to the underlying geology, the pylons have a complex geometry.
BWSL consists of twin continuous concrete box girder bridge sections for traffic in each direction. Each bridge section, except at the cable-stayed portion, is supported on piers.
In the past, the Causeway of Mahim was the single road which connected Mumbai’s primary business areas with western suburbs. North – Southwestern corridor was a big hindrance and led to serious congestion in the peak times. In order to lower the congestion, the West Island- Freeway got planned to cover the coastline (western) of this city. As a part of this freeway project, the Bandra Worli Sea link was the first phase, where a bridge would be built over the Mahim Bay. This provided a route other than that of Mahim Causeway
Through the Sea Link, western Express Highway intersection with Swami Vivekanand road at Bandra was connected to Worli’s Khan Abdul Ghaffar Khan Road. From the seaface at worli, it goes into the arterial road of Annie Besant road.
Maharashtra State Road Development Corporation Limited commissioned this project and created the bandra worli sea link history. Hindustan Construction Company was provided the contract for working on the construction part, with the management done by United Kingdom offices at Dar Al-Handasah, which had brought important technologies from China.
Laying of first stone completed by Mr. Bal Thackeray in 1999. Initially, the plan estimate was at a cost of 6.6 billion rupees, with a period of completion estimated at 5 years. But, many PILs were filed against the project, which caused its delay by 5 years, and hence the cost was increased to 16 billion rupees, with interest being 7 billion INR.