When driving on the freeway behind a large truck, you should:

Decrease your following distance to improve fuel efficiency.
Drive farther behind the truck than you would for a passenger vehicle.
Drive closely behind the truck in bad weather because the driver can see farther ahead.
Drive no more than one car length behind the truck so the driver can see you.
Explanation

Maintaining a safe distance from large trucks reduces the risk of rear-end collisions, which are often caused by tailgating. Trucks, buses, vans, or vehicles pulling trailers may have limited visibility of vehicles directly behind them due to their size and height. Therefore, driving farther behind a large truck ensures that you remain visible to the driver and provides you with a clear field of vision to anticipate and react to any potential hazards.

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