What safety time interval is recommended to maintain relative to the vehicle ahead on roads outside urban areas?

Question

DentroTest · Accepted Answer

The general rule to avoid rear-end collisions is to maintain a minimum separation of 2 seconds in dry conditions (enough time to react to sudden braking). However, when driving on roads outside urban areas where speeds are higher, the road safety recommendation is to extend this interval to 3 seconds. This provides a vital extra margin. A 1-second interval is dangerous (it barely covers reaction time), and 4 seconds or more is recommended in adverse conditions (rain, ice) or tunnels.

What safety time interval is recommended to maintain relative to the vehicle ahead on roads outside urban areas?

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