* Loss of steering control: Without power steering, it becomes extremely difficult, and potentially impossible, to turn the steering wheel, especially at low speeds. You could lose control of the vehicle.
* Loss of braking power: Power brakes assist your braking significantly. Without them, stopping the car requires much greater force on the brake pedal, which may not be possible in an emergency. Stopping distances will increase dramatically.
* Potential for the car to roll: If the car is on an incline, turning off the engine while in drive might cause it to roll unexpectedly, potentially leading to a collision.
In short, turning off your car while it's in drive creates a dangerous situation that significantly reduces your ability to control the vehicle. It's crucial to always put the car in park (P) before turning off the ignition.