Sound barriers make city’s busy junctions less noisy
MUMBAI: Mumbai may be India’s noisiest city, but the setting up of sound barriers at flyovers near residential areas has significantly brought down decibel (dB) levels, a study by Delhi-based Central Road Research Institute (CRRI) has found.
On the Lalbaug-Bharatmata flyover on Dr Babasaheb Ambedkar Road, the study recorded a 17dB drop in noise levels, as a result of a first-of-its-kind micro-perforated sound barrier technology being installed there. Mumbai is the only city in India to use the micro-perforated noise barrier.
The study found a 13.5dB drop in noise at all other flyovers, where rockwool sound barriers — made of rock dust — have been in place.
The noise level at busy traffic junctions and flyovers where vehicles travel at an average of 90kmph, is 81.5dB — about the same as an alarm clock. This means the barriers brought down noise levels at Lalbaug-Bharatmata flyover to 64.5dB (conversational speech), and at the other flyovers to 68dB (sound of vacuum cleaner).
“After successfully implementing the sound-barrier technology in Mumbai based on similar models in the US and Europe, it will be replicated at the Kolkata Metro and private development projects in Hyderabad this year,” said Naseem Akhtar, a principal scientist at CRRI.
MMRDA had roped in the institute to design the sound barriers for the flyovers at Sion hospital junction, King’s Circle, Hindmata junction, Lalbaug-Bharatmata, Dahisar flyover, BKC and Jogeshwari Vikhroli Link Road flyover outside IIT Powai around six years ago.
“All spots in Mumbai where barriers have already been placed or will be placed were categorically chosen as they are the busiest spots and surrounded by residential pockets,” said Prakash Mamdapure, engineering chief, MMRDA.
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