The extra space in front of a large truck is needed for:

Other drivers when merging onto a freeway.
Other drivers when they want to pass the truck.
The truck driver to stop the vehicle.
Aerodynamic purposes and to reduce fuel consumption.
Explanation

It is important to maintain extra space in front of a large truck because their size and weight can impact their maneuverability and stopping distance. Large trucks require more time and distance to come to a complete stop compared to smaller vehicles.

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