Follow Distance When Driving
Following distance when driving:
As a rule, you should give about one metre of space between you and the vehicle ahead for every mile per hour that you are travelling in good conditions. You should double this in the wet. Be aware that when driving at 40 mph or more this rule will still be less than your overall stopping distance.
It is not easy to judge the correct separation distance so the two second rule should be applied.
The two second rule:
This means you should pick a stationary marker at the side of the road. When the vehicle ahead passes it there should then be a full two seconds of time passed before you reach that marker. You should double this in the wet.
It takes two seconds to say: ‘Only a fool breaks the two second rule’.