Volvo's self-drive convoy A convoy of self-driven cars has completed a 200km (125-mile) journey on a Spanish motorway in the first public test of such vehicles. The cars were wirelessly linked to each other and "mimicked" a lead vehicle, driven by a professional driver. The so-called road train has been developed by Volvo. The firm is confident that they will be widely available in future. The project aims to herald a new age of relaxed driving. Spain - June 2012 -