What is the formula for following distance?

• A. 2 Second Rule
• B. 4 Second Rule
• C. 5 Second Rule
• D. 3 Second Rule (1001, 1002, 1003)

Answer: (D)

Maintaining a safe following distance relies on having enough time to react and stop if the vehicle ahead suddenly brakes. The three-second rule is the standard way to measure that gap: pick a fixed point on the road, and as soon as the lead vehicle passes it, start counting. If you reach the same fixed point before you finish counting to three (for example, 1001, 1002, 1003), you’re too close and should back off to create a three-second gap. This timing translates into a practical buffer at any speed, giving you measurable space to brake safely. In adverse conditions—wet roads, rain, snow, ice, or low visibility—extend that gap beyond three seconds to maintain safety.