Abstract: The present invention relates to a method and an arrangement for imparting an impulse to a vehicle while underway by way of one or more actuators, the driver normally reacting spontaneously and subliminally to the impulse. The invention is characterized in that the impulse is imparted to the steering or to some other part with which the driver actively interacts and that the driver's response is detected by one or more sensors, for example steering angle sensor, torque sensor, g-force sensor, eye movement sensor, etc.