You should allow for an extra cushion of space when following large vehicles because:

Because it's easier to pass them when you increase your following distance.
The drivers of large vehicles may not be able to see you when you are directly behind them.
This will encourage the drivers of large vehicles to drive around you.
Large vehicles take longer to stop.
Explanation

Unlike cars, trucks have significant blind spots directly behind them, known as the "No-Zone." Tailgating in this area can be dangerous because truck drivers may not be able to see the vehicle directly behind them. As a result, drivers in smaller vehicles may not be visible to the truck driver, increasing the risk of accidents if the truck were to make sudden maneuvers or stops.

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