North Carolina Emergency Vehicle Driver (EVD) Practice Test

Maintaining a safe following distance is measured in time, not a fixed distance in feet, because speed changes how far you travel in that moment. A safe gap gives you enough time to notice the lead vehicle slowing, react, and brake without collision. Under normal conditions you should aim for a multi-second following distance, and you’ll naturally have more space as your speed increases. Increase that gap further when road conditions are poor, such as rain, ice, or low visibility, to account for longer stopping distances and slower reaction times. Short gaps like one or two seconds don’t provide adequate stopping distance at typical speeds, and saying there’s no set distance ignores the safety margin you should maintain. In short, several seconds of following time, adjusted for speed and conditions, is the recommended rule.