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Difficulty: MediumSpace to Cross or Enter Traffic

While preparing to cross a multi-lane undivided highway from an unsignalized side road in a heavy commercial vehicle, what primary factor must you verify before initiating movement?

  1. A
    That approaching cross-traffic has adequate sight distance to brake to a full stop once your tractor enters the first travel lane.
  2. That the gap in traffic provides enough time and distance for your entire vehicle length to completely clear all travel lanes.Answer
  3. C
    That your vehicle can maintain standard following distance intervals while traversing across the active traffic lanes.
  4. D
    That the steer axle reaches the opposite shoulder before cross-traffic arrives, regardless of trailer off-tracking or position.

Answer

Verify that the gap in traffic provides enough time and distance for your entire vehicle length to completely clear all travel lanes before cross-traffic arrives.
Because heavy commercial vehicles accelerate slowly and have substantial total length, crossing a multi-lane roadway takes significantly more time than it does in a passenger car. The driver must ensure the gap in approaching traffic is large enough for the entire length of the vehicle to completely clear all travel lanes before oncoming traffic arrives.

Step-by-Step Solution

1
Assess the acceleration limitations and total length of the commercial vehicle.
Recognize that heavy combination vehicles accelerate slowly and require significant time to travel across multiple highway lanes.
A heavy vehicle cannot accelerate quickly from a complete stop, increasing the time needed to cross.
2
Evaluate the speed and distance of approaching cross-traffic in all lanes.
Identify a traffic gap that accommodates the full traversal time needed for the entire unit.
The entire vehicle, including the rear trailer bumper, must clear the active roadway without causing cross-traffic to slow down or swerve.
3
Select the correct operational principle for crossing traffic.
Confirm that a safe crossing requires a gap large enough to clear the total vehicle length before cross-traffic reaches the intersection.
Ensures complete intersection clearance and prevents side-impact collisions.

Key Concept

Space to Cross or Enter Traffic
Estimated Time:1m 0s
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Topics

Space to Cross or Enter Traffic

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