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For heavy duty commercial vehicles it is recommended 4-6 seconds following distance for speeds under 30 mi/h (48 km/h), and 6-8 seconds following distance for speeds over 30 mi/h (48 km/h). [9] Rear-end collisions are the number one type of traffic collisions .
Some areas recommend a three-second rule instead of a two-second rule to give an additional buffer. The rule is not a guide to safe stopping distance, it is more a guide to reaction times. The two-second rule tells a defensive driver the minimum distance needed to reduce the risk of collision under ideal driving conditions.
The rule is the specific spatial case of the common law basic speed rule, [13] and an application of volenti non fit injuria. The two-second rule may be the limiting factor governing the ACDA, when the speed of forward traffic is what limits the basic safe speed, and a primary hazard of collision could result from following any closer. [2] [3]
The two-second rule tells a defensive driver the minimum distance to avoid collision in ideal driving conditions. The red car's driver picks a tree to judge a two-second safety buffer. Defensive driving describes the practice of anticipating dangerous situations, despite adverse conditions or the mistakes of others when operating a motor vehicle.
A fine of up to $250 and three points on your license for a second offense within two years. A fine of up to $500, four points on your license and a 90-day driver's license suspension for a third ...
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Experts historically used a reaction time of 0.75 seconds, but now incorporate perception resulting in an average perception-reaction time of: 1 second for population as an average; occasionally a two-second rule to simulate the elderly or neophyte; [Note 4] or even a 2.5 second reaction time—to specifically accommodate very elderly ...