Tailgating on the highway is a pretty dangerous thing and, in some cases, can be a ticketable offense. In the future, though, it could be a way to ease traffic congestion and to boost fuel mileage on highways. In this guise it's called platooning, something that we saw GM's crazy futuristic EN-V doing when we took it for a spin out in Vegas. Volvo is getting in on the game too, participating in the European Safe Road Trains for the Environment Project, or SARTRE. It's a research program looking into a standard way to have "trains" of autonomou
