Final answer:
To steer a motor vehicle in neutral by another vehicle, the driver needs to apply force to the steering wheel without power-assistance and rely on sufficient tire-road friction for control.
Step-by-step explanation:
To steer a motor vehicle that is turned off and in neutral by another vehicle, a driver would need to exert control over the steering wheel to direct the vehicle appropriately. While the engine is off, the power-assisted steering would not be functional, making the steering heavier and more difficult to operate. It is crucial to ensure that the tires maintain adequate friction with the road. According to the given information, a car turning to the left on level ground requires a certain minimum coefficient of friction between the tires and the road to follow a circular path due to centripetal force. If this friction is not sufficient, the car could skid and potentially leave the roadway. When in neutral, a vehicle's wheels can roll freely, but controlling it is significantly harder without the aid of powered systems.