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Difficulty: Very hardSharing the Road with Large Vehicles

You are driving on a multi-lane urban roadway and notice a large commercial tractor-trailer ahead in the right lane signaling a left turn while swinging widely to the right side of the road before initiating the maneuver across the intersection. An adjacent driver accelerates to pass the truck on its left side while another driver attempts to squeeze into the open space on the truck's right side. Which of the following best describes the underlying mechanical hazard of this scenario and the correct driver response?

  1. Large trucks experience off-tracking where the rear wheels follow a shorter path than the front wheels, creating an unstable squeeze zone; surrounding vehicles must wait behind the truck until the turn is fully completed.Answer
  2. B
    The truck driver is executing an illegal multi-lane maneuver without proper right-of-way; adjacent drivers should sound their horn and accelerate past the truck within the intersection to clear the hazard quickly.
  3. C
    The truck driver has misjudged the turning radius and lost rear visibility; vehicles directly behind should tailgate closely to signal the truck driver to complete the turn faster.
  4. D
    Commercial combination vehicles have shorter stopping distances and sharper turning capabilities than standard passenger cars, allowing trailing drivers to maintain the maximum posted speed limit during the turn.

Answer

Large trucks experience off-tracking where the rear wheels follow a shorter path than the front wheels, creating an unstable squeeze zone; surrounding vehicles must wait behind the truck until the turn is fully completed.
Large commercial combination vehicles undergo off-tracking during turns, meaning the rear wheels track closer to the curb or inner lane than the front wheels. When turning left or right, truck drivers must swing wide to accommodate this geometric path. Drivers surrounding the truck must recognize that open gaps beside a turning truck are temporary squeeze zones and must remain well behind the vehicle until the turn is fully executed.

Step-by-Step Solution

1
Analyze the physical behavior of large commercial vehicles during turning maneuvers.
Identify off-tracking: the rear wheels follow a tighter, shorter radius than the front steering wheels.
Vehicle length and distance between kingpin/axles force the trailer to cut corners internally.
2
Evaluate the visual setup and potential hazards caused by the truck's wide positioning.
Recognize that the open space created when a truck swings wide is not an available lane, but a temporary space buffer needed to execute the turn.
Attempting to pass or squeeze into this space places vehicles directly in the off-tracking arc and truck blind spots.
3
Determine the proper defensive driving action.
Maintain a safe following distance and remain positioned behind the truck until it completes the full turning maneuver.
Ensures safety by keeping your vehicle out of the truck's No-Zones and off-tracking path.

Key Concept

Off-Tracking and Wide-Turn Squeeze Hazards of Commercial Vehicles
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Topics

Sharing the Road with Large Vehicles

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