If your engine fails while you are in motion, your immediate priority is maintaining control and safety. First, keep your composure and firmly grip the steering wheel; you will lose power steering, making the car much harder to turn, but it is still steerable. Second, steer the vehicle toward the shoulder or the side of the road immediately while you still have momentum. Avoid sudden swerving, as this can cause accidents with other motorists. Third, once you have safely cleared the flow of traffic, turn on your hazard lights to signal to others that your vehicle is disabled. Only after you are safely parked should you attempt to restart the engine or call for emergency roadside assistance. Note that power brakes will also lose their vacuum assist after one or two pumps, so apply the brakes firmly and steadily.