Examkin

Question

Difficulty: MediumSpace to Cross or Enter Traffic

A driver operating a heavily loaded bulk transport truck is waiting at an unsignalized intersection to cross opposing lanes and turn left into traffic moving at 55 mph. Which of the following factors primarily determines the size of the gap required to enter the traffic stream safely?

  1. A
    The safe following distance needed to maintain space behind leading vehicles once cruising speed is achieved.
  2. B
    The degree of off-tracking produced by the rear trailer wheels during the turning radius.
  3. The slow acceleration caused by total vehicle weight and length, requiring ample time to reach traffic speed without disrupting approaching vehicles.Answer
  4. D
    The total stopping distance required to brake the vehicle to a halt if cross-traffic fails to yield the right-of-way.

Answer

The slow acceleration caused by total vehicle weight and length, requiring ample time to reach traffic speed without disrupting approaching vehicles.
Because large, heavy commercial vehicles accelerate slowly and possess substantial overall length, they require a significantly larger gap in traffic than passenger vehicles. The driver must wait for an opening large enough to enter, complete the turn, and accelerate up to the prevailing speed of traffic without forcing oncoming motorists to slow down or alter course.

Step-by-Step Solution

1
Analyze vehicle operating characteristics during traffic entry.
Heavy commercial vehicles take substantially longer to accelerate and clear intersections than passenger cars due to their weight and overall combination length.
Understanding acceleration lag is essential for calculating traffic entry requirements.
2
Evaluate the safety standard for merging into active traffic flow.
The driver must select a gap in oncoming traffic that allows sufficient time to cross the roadway and accelerate up to flow speed without forcing approaching vehicles to brake or swerve.
Commercial drivers must never assume other motorists will adjust their speed to accommodate slow-moving entries.
3
Identify the primary governing factor for gap judgment.
The requirement is dictated by slow acceleration and vehicle length, requiring a large gap.
Matching acceleration capacity to roadway speed ensures smooth traffic integration.

Key Concept

Space to Cross or Enter Traffic
Estimated Time:1m 0s
Rate this question

Topics

Space to Cross or Enter Traffic

More questions from this topic