If you need to travel backward, make sure the vehicle is at a complete stop before changing gears in or out of "reverse." Slide the gear shift to select the gear marked "R" and check behind/ around you for any possible obstructions. Gently remove your foot from the brake and place it on the accelerator. When turning in Reverse, your car will turn in the same direction that you turn the wheel. You're just going backwards, so the end of the car will swing in that direction, rather than the front. " The "neutral" gear is only to be used when you have no need to control the speed of your car, not when driving regularly. Examples of this include when idling parked for a short time or when being pushed/towed. The gears marked "1," "2," and "3" are known as lower gears. These can work as a sort of in-engine brake system when you need to save your actual brakes. Going down steep hills is a good use of this technique. 1st gear, however, is only to be used when you must go very slowly. There is no need to stop when shifting between these gears and Drive.

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Write a summary of the previous text in Vietnamese:
Lùi xe. Dùng số "Neutral" (số "mo"). Dùng số thấp hơn.