Point #6 is "Allow 2 - 4 Seconds Following Time".

This point relates directly to your space cushion. We used to measure this gap in car lengths, but not any longer. It was difficult to judge what a car length was and few people could accurately judge distance in feet while traveling down the highway. So, now we measure following distance in time rather than feet or car lengths.

To measure, find a fixed object along the road -- a speed limit sign, tree or building. When the rear bumper of the car ahead passes the object, begin counting "One thousand one, one thousand two, one thousand three". You should reach at least the beginning of One thousand three” before your front bumper passes that object.

A gap of four seconds between you and the vehicle in front of you is ideal, especially in bad weather and night driving.

Using this method allows time to recognize trouble should the driver in front suddenly slam on his brakes. It gives you time for your brain to send a signal to your foot to step on your brakes and safely bring your car to a stop, if necessary.