New Mexico Class D Written Test Practice
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Passing target: 70% (21/30)
The car ahead of you passes a road sign. You start counting "one-thousand-one, one-thousand-two" and reach the same sign before you say "one-thousand-three." What does this tell you?
B is ahead of A on a dry road. A’s front bumper is beside the roadside sign. The card says the count began when B passed it and A reaches it before the count reaches three.
Correct answer: You are too close; drop back and count again until you reach three seconds.
Why
Rear-end crashes are very common, and most happen because the following driver has too little time to stop when the vehicle ahead stops suddenly. Because the count measures time rather than feet, the gap in feet grows by itself as your speed goes up. Some situations call for more room than three seconds, such as following a motorcycle, pulling a trailer or approaching a railroad crossing.
Verified against New Mexico Driver Manual · Following distance (three-second rule) · p. 26, 27
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