Judging speed and distance of other cars and objects while driving is extremely important. When another driver makes a mistake, you need time to react. When you pass someone, approach a busy intersection or are merging onto a freeway you must be able to judge whether or not your meneuver will be sucessful and safe.

If a vehicle is traveling at 65 mph, it will travel 95 ft in one second. If there is an oncoming vehicle also traveling 65 mph, the distance between the two will shrink 190 ft. each second. Using the same relative speeds the two vehicles would get a full football field closer to one another In only 1.5 seconds. When vehicles appear to be standing still, in the distance, they are generally far enough away. If you can really tell they are moving toward you they are probubly too close to pass.