A vehicle being a ground effect road vehicle having an underside and being supported on a running surface, the ground effect road vehicle comprising a first duct configured to channel air from a first outlet at the underside of the vehicle to a second outlet away from the underside of the vehicle so that when the vehicle is in forward motion the underside of the vehicle in front of the first outlet is at a lower pressure than the underside of the vehicle behind the first outlet, the vehicle being configured so that the underside of the vehicle is in sufficient proximity to the running surface so that a flow of air entering the region between the underside of the vehicle and the running surface is accelerated in the region between the underside of the vehicle and the running surface to generate downforce on the vehicle.