something like this happened to our van before. the engine just died while cruising, so in a way, parang turning off the key/ignition na din. the van had power steering and brakes. so when the engine died, pati power steering and brakes, nawala din. when the steering goes, mahirap na mag steer, and when you're unlucky enough to lock the steering going 60kph.. well you imagine the rest. buti na lang i was just going 30 or so in an open road.