Sion flyover was commissioned for traffic in 2003.The structural audit of the Sion flyover conducted by IIT-B last year had recommended these repairs. Expert says shutdown disastrous for trafficMUMBAI: From April 20, the busy Sion flyover on Dr Ambedkar Road will remain shut for traffic for two months as its load-bearings will be replaced. Another alternative for those using Sion flyover would be the Eastern Freeway.Activist A V Shenoy of Mumbai Vikas Samiti said: "This repair work is MSRDC's knee-jerk reaction to the Himalaya foot over-bridge collapse at CSMT. Accordingly, a contractor was appointed.The MSRDC earlier had plans to extend the flyover by adding three lanes. What the city needs is a planned approach to repairs and replacements, and a proper mechanism in place for periodic inspections..