The ultimate test of human nerve and a car's technology! ford.eu You need to be tough to play American football. But tough enough to drive headlong towards an oncoming truck and not touch the brakes? Ford Active City Stop is an innovative system that automatically brakes if a car in front stops unexpectedly. So a team of American footballers were asked to put the technology (and their bravery) to the test in a fleet of Ford Focus cars. Awesome game!