Sound bar­ri­ers make city’s busy junc­tions less noisy

Hindustan Times ST (Mumbai) - HT Navi Mumbai Live - - FRONT PAGE - Badri Chatterjee badri.chatterjee@hin­dus­tan­

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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