Examkin

Question

Difficulty: EasySpace to Cross or Enter Traffic

A commercial driver is preparing to merge a fully loaded combination vehicle onto a highway with active traffic flow. Why does this vehicle require a substantially larger gap in traffic to enter safely compared to a passenger car?

  1. A
    Approaching highway traffic is legally obligated to yield right-of-way and slow down for merging commercial vehicles.
  2. Large, loaded vehicles accelerate slowly and require significantly more time and distance to reach the flow speed of traffic.Answer
  3. C
    Air brake systems require a wider margin of error to stop the vehicle instantly if entering traffic too closely.
  4. D
    The gap needed is identical to passenger cars as long as trailer off-tracking is accounted for during the merge.

Answer

Large, loaded vehicles accelerate slowly and require significantly more time and distance to reach the flow speed of traffic.
Because of vehicle weight, length, and slow acceleration under heavy load, commercial motor vehicles require a much larger gap in traffic to safely enter or cross roadways without causing approaching drivers to brake or swerve.

Step-by-Step Solution

1
Identify the vehicle characteristics affecting traffic entry
Heavy combination vehicles have high gross weight and slow acceleration capability relative to passenger vehicles.
Vehicle acceleration rate determines how quickly a vehicle can enter a traffic stream and match highway speed.
2
Determine the space requirements based on acceleration and length
A large opening in traffic is necessary to enter without impeding oncoming vehicles.
Entering without a large enough gap forces other drivers to brake abruptly or change lanes, creating collision hazards.

Key Concept

Commercial vehicles require large traffic gaps to enter or cross traffic due to slow acceleration under load and overall vehicle length.
Estimated Time:45s
Rate this question

Topics

Space to Cross or Enter Traffic

More questions from this topic