A real-life demonstration of the all-new Renault OptiTrack temporary four-wheel drive system that can convert a 4x2 tractor into a 4x4 at the flick of a switch! Sequence shot by Biglorryblog for ww.roadtransport.com on the Renault test track at Montalieu Vercieu in france---it clearly shows a 'before and after' clip of the system working. [ Ссылка ]
