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It is best to follow 100 feet or more. This gives you space to react to and avoid debris flying back at your car, and more than enough room to stop in the event of an emergency.

Added: While the "10 feet for every 10 MPH of speed rule" is a good guideline, the above answer is a good one for following a commercial truck or bus. If you get too close to the rear of the truck/bus you move in too close for the driver to see you in his sideview mirrors and you are too close to see anything around the truck.

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12y ago
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12y ago

You should be far enough behind that you can see their side-view mirrors. This gives assurance that they, in turn, are able to see you. That's a minimum. Ideally, you would want to remain 200 feet or more behind them, in order to minimize risk of damage to your windshield by rocks picked up from the road.

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Q: When following a 18 wheeler truck in a car how many feet behind do you follow?
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