You should allow more space in front of your vehicle when following large trucks because:

Their heavier weight allows them to stop more quickly than you.
If you follow too closely, you will get caught in the wind draft caused by the truck.
The extra space allows you to see around the truck.
All of the above.
Explanation

Tailgating is always dangerous because you decrease your own safety distance if the vehicle in front of you stops quickly. When following a large truck, you should allow more space in front of your vehicle because it helps you to see around the truck and stay out of its blind spot. The blind spot is an area around the truck where the truck driver is unable to see other vehicles. When you follow too closely behind a truck, the trucker has no way of knowing you are there, which increases the chances of a rear-end collision.

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