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Difficulty: MediumSharing the Road with Large Vehicles

When merging onto a highway directly in front of a large commercial truck, a passenger vehicle driver can safely reduce speed immediately after completing the merge because commercial trucks have heavy-duty air brake systems that allow them to stop in a shorter distance than standard passenger cars.

Answer: Answer

Answer

The statement is False. Large commercial trucks require significantly longer stopping distances than passenger cars due to their vehicle mass and air brake system lag, so drivers must never cut in front of a truck and brake abruptly.
The statement is false because large commercial trucks require up to double the stopping distance of standard passenger cars at highway speeds. Cutting in front of a truck and decelerating abruptly deprives the truck driver of the space cushion required to stop safely.

Step-by-Step Solution

1
Analyze vehicle physical properties and braking mechanics
Large commercial trucks weigh up to 80,000 pounds, giving them vastly greater momentum than a standard passenger vehicle.
Vehicle weight directly increases the kinetic energy that brakes must dissipate during deceleration.
2
Compare stopping distances between trucks and cars
At highway speeds, a fully loaded tractor-trailer takes nearly twice as far to come to a complete stop compared to a passenger car.
Air brake systems require an extra fraction of a second for air pressure to build, adding to total stopping distance.
3
Evaluate safety of decelerating after merging in front of a truck
Slowing down immediately after merging eliminates the truck's safe cushion space, creating a high probability of a rear-end collision.
The commercial truck behind cannot match the rapid deceleration rate of a passenger car.

Key Concept

Large vehicle stopping distances and merging safety
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Topics

Sharing the Road with Large Vehicles

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