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Difficulty: MediumSharing the Road with Large Vehicles

When preparing to make a left turn at an intersection with two designated left-turn lanes, a large commercial truck should use the outer (rightmost) left-turn lane.

Answer: Answer

Answer

True. Large commercial trucks should use the outer (rightmost) left-turn lane in a dual left-turn setup to safely accommodate off-tracking.
Because of off-tracking, the rear wheels of a large commercial truck follow a tighter path than the front wheels. Choosing the outer left-turn lane allows the truck driver to complete the turn safely while keeping adjacent turning lanes clear.

Step-by-Step Solution

1
Analyze vehicle turning dynamics for large commercial trucks.
Recognize off-tracking, where the trailer rear wheels turn in a tighter radius than the front steering wheels.
Off-tracking dictates how much lateral clearance a long combination vehicle requires during turns.
2
Determine safe lane selection in dual left-turn lanes.
Selecting the outer (rightmost) left-turn lane allows the trailer to off-track safely without cutting into adjacent turning lanes.
If the truck used the inner lane, its trailer would sweep across the adjacent outer lane, blocking traffic and causing potential side-squeeze collisions.

Key Concept

Off-Tracking and Multi-Lane Turn Positioning for Commercial Vehicles
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Topics

Sharing the Road with Large Vehicles

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