India, Dec. 19 -- The Gurugram traffic police have issued about 423 challans against motorists for flouting the Graded Response Action Plan (GRAP)-IV norms, including failure to produce a valid Pollution Under Control (PUC) certificate or driving vehicles with emission standards other than BS-VI, official said on Thursday. They added that zonal officers have been directed to step up vigilance against motorists flouting norms.

According to traffic police data, around 61 motorists with BS-III vehicles and 270 with BS-IV diesel vehicles were penalised in Gurugram between December 14 and 17, after the authorities on December 13 enforced Grap-IV in the National Capital Region (NCR).

Vikas Verma, public relations officer of Gurugram traffic p...