Keeping a space cushion between you and the other vehicles around you is important because it:

Keeps traffic flowing at a safe pace.
Gives you time to react to situations.
Keeps other drivers alert.
Prevents distractions from other vehicles.
Explanation

You need to keep enough following distance between you and the vehicles ahead to avoid a crash if the traffic stops suddenly. The more distance between your vehicle and others, the more time you have to react.

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