What following distance rule is commonly taught in DriveSafe Online?

• A. The two-second rule.
• B. The three-second rule in normal conditions, extending to four seconds or more in adverse conditions.
• C. The four-second rule in all conditions.
• D. One car length per 10 mph.

Answer: (B)

A safe following distance hinges on giving yourself enough time to perceive, react, and brake. In normal driving, a three-second cushion gives a reliable buffer that accounts for your perception-reaction time and typical braking distance. When conditions aren’t favorable—wet or icy pavement, reduced visibility, or other hazards—you need more time, so increasing to four seconds or more provides extra margin to cope with longer stopping distances and slower reaction.

You can check your distance by using a fixed object on the road: as the car in front passes it, start counting seconds. If you reach the object before finishing three seconds, back off a bit; if conditions are poor, aim for four seconds or more. Remember, speed affects how much distance you need, and difficult conditions can require even more cushion than four seconds.

Other rules are less reliable. A two-second rule can be too close at higher speeds, and a four-second rule for all conditions is unnecessarily cautious and can disrupt traffic flow. A simple distance like one car length per 10 mph doesn’t adapt well to speed or road conditions and isn’t as safe.