The logo of the carmaker Opel is seen on the rusty bonnet of a vintage Opel Caravan estate vehicle in Berlin, August 23, 2012. General Motors' ailing German unit Opel will cut the hours of several thousand workers at two of its four plants in response to a drop in demand for cars in Europe. Opel agreed with labour representatives to halt production for a total of 20 days at its main factory in Ruesselsheim and its component plant in Kaiserslautern between September and the end of the year, it said on Thursday, confirming an earlier report. REUTERS/Thomas Peter (GERMANY - Tags: TRANSPORT BUSINESS LOGO)