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

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