Speed control affects physical force, in turn affecting driver control and vehicle performance.

A good driver always keeps a safe distance from the car in front of him or her. The faster you go, the greater the distance you should keep from the car ahead of you. A good rule is to stay at least two (2) seconds behind the vehicle ahead of you at speeds less than 35 mph; stay at least 3 seconds behind the vehicle ahead of you at speeds up to 45 mph; and stay at least 4 seconds behind the vehicle ahead of you at speeds up to 70 mph.

For example, when the vehicle ahead of you passes a fixed object and you reach this same fixed object in less than the number of seconds suggested above, you are following too closely.

Good drivers also should adjust their speed according to their physical condition, and according to the physical condition of their vehicle’s tires, shocks, and brakes. Thus, if you are tired, or if your vehicle's tires are becoming worn, you should slow down and maintain a greater following distance.

Learn these tips by taking an OnlineDefensive Driving course.