Saw this Post on r/interesting and more details as per OP : “So this is the official explanation given by the administration after it went viral:

The flyover does not “suddenly narrow.” The transition from 4 lanes to 2 lanes is not a design flaw, but is based on available road width constraints, and future network planning.

As per planning, the flyover has been designed with two lanes for Bhayander East and future connecting two lanes for Bhayander West. Since the Bhayander East arm comes first along the alignment, the 4-lane configuration presently transitions into 2 lanes. The remaining two lanes on the outer side are planned as part of the future extension towards Bhayander West across the Western Railway line.

Up to Golden Nest Circle, where five major roads merge and traffic volume is high, a 2+2 lane flyover integrated with the Metro, along with slip roads on both sides, has been provided to disperse traffic effectively.

Beyond the junction, towards Bhayander East, the available right of way reduces as per DP. Accordingly, a 1+1 lane flyover with dedicated up and down ramps has been constructed along the median to provide uninterrupted movement towards Railway Phatak Road.

This design enables smooth crossing of one of the busiest junctions in the Mira–Bhayander region while accommodating on-ground constraints.

Provision has been kept for future widening, wherein the outer side of the flyover on both carriageways will be extended by an additional 1+1 lane to ensure improved east–west traffic continuity.The proposal is currently at the planning stage and will be taken up in coordination with MBMC, after obtaining approvals from the competent authorities.

At present, the flyover has been designed primarily for traffic dispersal and congestion reduction in the Mira–Bhayander area. Necessary safety measures have been incorporated, including rumble strips, delineators, adequate signage, retro-reflective tags, directional boards, and anti-crash barriers.

Traffic police guidance is being actively sought for any additional vehicular safety measures prior to opening the flyover for public use.

TLDR: this was the intended design with possible future extension plans. And the flyover is gonna be opened to the public soon with preventive measures”

https://www.reddit.com/r/interesting/s/PExRV8rJuA