PROTON has reinforced its green credentials by supplying a further 35 liquefied petroleum gas-powered Compact and Persona police cars to Humberside Constabulary. The Malaysian manufacturer now supplies more than a quarter of the force's patrol fleet after delivering 20 gas-powered Personas last year.

The latest acquisition of 24 fully-liveried Persona 1.3- and 1.5-litre cars and 11 Compact patrol cars will enter active service across the whole force next month. Cars will be converted to run on LPG in an attempt to cut fuel emissions and reduce running costs. It is the second stage of an on-going initiative by Humberside Police to convert its entire fleet to LPG after a pilot project last year.

Part-funded by the Government's Powershift alternative fuel conversion scheme, the vehicles are capable of running on both petrol and LPG, with a dashboard switch enabling the driver to transfer from one type of fuel to the other.