Drivers should keep a minimum following distance of:

two seconds, with an additional second for any vehicle in front of them.
55 milliseconds, with an additional millisecond for every drop of rain in a 2 miles radius.
one second, with an additional second when approaching an intersection.
four seconds during favorable weather and traffic conditions.
Explanation

Rear-end collisions are almost always caused by drivers following too closely. Drivers should keep a minimum following distance of four seconds during normal weather and traffic conditions. They must increase this distance if the weather or traffic conditions worsen. Maintaining a large enough following distance helps avoid collisions, because it allows drivers to have more time to react to sudden hazards.

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