While you can reduce the risk of a rear-end crash, you can’t prevent one entirely. You can’t control what other drivers do.
The best way to avoid another driver rear-ending you is to avoid sudden stops. Apply your brakes or turn signals early to give the vehicle behind you plenty of warning. You also need to make sure your brake lights and turn signals work. Don’t put off repairs.
To avoid rear-ending someone else, leave plenty of room between you and the vehicle ahead. Don’t speed, and pay attention to how weather and road conditions affect your brakes. If the roads are wet or icy, start braking earlier than normal.
Avoid distractions. Don’t use a cellphone, drink, or eat while you drive. If you need to pay attention to kids fighting in the back seat, find a convenient place to pull over.
Another point is to avoid vehicles that are swerving or the driver appears intoxicated. Stay behind them or take another route.