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Question

Difficulty: HardSpace for Turns

A heavy combination vehicle is executing a tight 90-degree right turn where substantial off-tracking is expected. Arrange the procedural steps in the correct chronological order from approach to completion to execute a safe button-hook turn without creating squeeze-play hazards.

  1. 1Maintain the vehicle close to the right curb line during the approach to prevent smaller vehicles from attempting to pass on the right.
  2. 2Drive straight out into the intersection past the corner curb line before initiating any steering rotation.
  3. 3Turn wide into the cross-street as you complete the turn, using extra space in the receiving roadway while monitoring trailer off-tracking in the right mirror.
  4. 4Center the combination unit within the designated travel lane of the cross-street and cancel the turn indicator.

Answer

The correct procedural order is: (1) Maintain vehicle position close to the right curb during approach, (2) Drive straight out into the intersection past the curb line, (3) Turn wide into the receiving cross-street while checking mirrors for off-tracking, and (4) Center the unit in the travel lane and cancel the turn signal.
According to commercial driving safety standards, a proper right turn with a long combination vehicle requires a 'button-hook' maneuver. The driver must first keep the rear of the vehicle close to the curb during the approach to close off the right side to other traffic. Second, the driver pulls straight into the intersection before turning. Third, the driver turns wide as they enter the cross-street (not on the approach), closely watching the trailer's off-tracking path in the right mirror. Finally, the driver straightens the vehicle into the proper traffic lane and cancels the turn indicator.

Step-by-Step Solution

1
Set up the approach along the right curb line.
Prevents trailing vehicles from squeezing into the right-side blind area.
Commercial motor vehicles must deny space on the right side prior to the turn to avoid trapping other road users.
2
Advance straight into the intersection beyond the corner.
Positions the drive axles and trailer pivot point deep enough to clear the corner curb.
Off-tracking causes rear wheels to follow a significantly tighter path than the front wheels.
3
Execute the turn by swinging wide into the cross-street (button-hook).
Completes the directional change using available space in the cross-street rather than encroaching on oncoming traffic prior to the intersection.
Swinging wide late in the turn (in the cross-street) keeps following traffic aware and prevents premature lane encroachment on the approach.
4
Align the tractor-trailer combination in the proper travel lane and cancel the signal.
Restores normal traffic flow and establishes lane discipline on the new roadway.
Finalizes the maneuver once the rear trailer tandem has completely cleared the turning radius.

Key Concept

Button-Hook Right Turn Execution and Trailer Off-Tracking Management
Estimated Time:2m 0s
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Topics

Space for Turns

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