As your speed increases, to stay safe it's important to:

Increase your following distance.
Keep your foot resting on the brake at all times.
Check your side-view mirrors more frequently.
Focus on improving your vehicle’s fuel efficiency.
Explanation

As your speed increases, your stopping distance also increases - even with ideal road conditions and properly working brakes. To stay safe, you should increase your following distance to allow more time to react in case the vehicle in front of you suddenly slows down or stops. On highways or interstates, a minimum following distance of four seconds or more is recommended. Tailgating at high speeds is dangerous and a major cause of multi-vehicle collisions.

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