( 1 ) THIS writ application was moved by the petitioners for protection of their own rights and also in public interest being aggrieved by the nuisance and noise pollution which are being created in the impunity by the transport operators by indiscriminate installation and use of electric and artificially generated air horns which cause unduly rash, shrill, loud and alarming noise. In the writ petition, the petitioners prayed for a writ in the nature of Mandamus commanding the Respondents to enforce the provisions of R. 114 of the Bengal Motor Vehicles Rules, 1940 and to enforce the restrictions against the use of such electric and other loud and shrill horns including air horns by operators of the transport vehicles. The case of the petitioners is that State of West Bengal is a thickly populated area and the density of population is one of the highest in India. It was further alleged that the prevailing noise level in this State particularly in the Calcutta Metropolitan Area is far in excess of the permissible limit and it is no longer in dispute that such excessive noise level poses positive danger to the residents of the respective locality. It also