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Question

Difficulty: Very hardSpace for Turns

You are operating a 53-foot combination vehicle approaching a large intersection with two designated left-turn lanes. Shortly after completing your left turn, you must execute a right turn onto a narrow two-lane street. To safely manage your vehicle's off-tracking and prevent blind-spot collisions, which of the following sequences describes the correct lane selection and turning maneuvers?

  1. Enter the rightmost left-turn lane, reach the center of the intersection before initiating the left turn, and later execute a button-hook right turn by keeping the rear wheels close to the right curb.Answer
  2. B
    Enter the leftmost left-turn lane to pre-position for the subsequent right turn, reach the center of the intersection before turning left, and later execute a button-hook right turn.
  3. C
    Enter the rightmost left-turn lane, initiate the left turn just before reaching the intersection center to establish your path, and later execute a jug-handle right turn by swinging left.
  4. D
    Enter the leftmost left-turn lane so vehicles remain visible on your right side, reach the center of the intersection before turning left, and later execute a jug-handle right turn to clear the curb.

Answer

The correct sequence involves utilizing the rightmost left-turn lane, reaching the intersection's center before turning, and performing a button-hook right turn.
This sequence correctly applies all three critical CDL rules for space management during turns. Using the rightmost left-turn lane ensures adjacent vehicles are on your left where visibility is unobstructed, reaching the intersection center prevents off-tracking into oncoming traffic, and the button-hook right turn safely blocks the right side from passing vehicles without swinging prematurely into opposing lanes.

Step-by-Step Solution

1
Evaluate the dual left-turn lanes and make a selection.
Select the rightmost left-turn lane.
When there are two left-turn lanes, the rightmost lane must be chosen so that other turning vehicles are on the left (driver's side), where visibility is superior. This prevents off-tracking into a vehicle hidden in the right-side blind spot.
2
Determine the proper turning apex for the left turn.
Proceed straight until reaching the center of the intersection before turning the steering wheel.
Turning too soon causes the trailer to cut the corner (off-track) directly into the path of oncoming traffic waiting at the intersection.
3
Execute the subsequent right turn onto the narrow street.
Perform a button-hook turn by keeping the trailer close to the curb and swinging the tractor slightly wide into the destination lane.
A button-hook turn prevents a gap from forming on the right side, blocking smaller vehicles from attempting to pass. A jug-handle turn (swinging left before turning right) creates a dangerous gap and is incorrect.

Key Concept

Off-tracking Management and Intersection Setup
Estimated Time:1m 30s
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Topics

Space for Turns

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