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Question

Difficulty: HardSpace to Cross or Enter Traffic

A commercial driver operating a 70-foot loaded tractor-semitrailer is stopped at a stop sign, preparing to turn left onto an undivided four-lane highway with traffic flowing at 55 mph in both directions. In what chronological sequence should the driver execute the gap assessment and entry procedures?

  1. 1Identify and wait for a continuous gap in traffic from both directions that accounts for total vehicle length and heavy acceleration lag.
  2. 2Perform a final visual sweep of oncoming traffic approaching from the left immediately before releasing the service brakes.
  3. 3Accelerate steadily across the near lanes in a single starting gear without shifting gears during the intersection crossing.
  4. 4Complete the left turn into the travel lane and accelerate steadily until matching the prevailing traffic speed.
  5. 5Monitor rear-view mirrors to verify that trailing vehicles maintain a safe following distance.

Answer

The correct procedural order begins with identifying an adequate two-way gap, conducting a final visual check to the left before releasing the brakes, accelerating across near lanes without shifting gears mid-crossing, accelerating to prevailing traffic speed in the destination lane, and finally monitoring rear mirrors to verify following distance.
Safely entering and turning left across a multi-lane highway requires a disciplined sequence: identifying an adequate two-way traffic gap that accounts for heavy vehicle length and slow acceleration, performing a final check to the left before brake release, accelerating continuously across opposing lanes in a single gear without shifting, reaching prevailing highway speed in the lane, and checking rear mirrors to confirm following distance.

Step-by-Step Solution

1
Evaluate both travel directions for a continuous traffic gap accommodating the vehicle's full length and slow acceleration rate.
Ensures the commercial vehicle can clear the near lanes and merge into the far lanes without impeding traffic.
Large loaded combination vehicles require substantially larger gaps than passenger cars because of slow acceleration and total vehicle length.
2
Perform a final check toward approaching traffic on the left immediately before releasing brakes.
Confirms the near lanes remain open and no vehicle is closing faster than anticipated.
Traffic from the left represents the immediate impact hazard upon entering the intersection.
3
Apply smooth acceleration across the opposing lanes in an appropriate starting gear without shifting.
Maintains uninterrupted forward momentum and avoids blocking opposing travel lanes.
Shifting gears mid-intersection risks missing a gear or losing momentum, which can strand a 70-foot vehicle across active lanes.
4
Complete alignment in the proper lane and accelerate up to prevailing highway speed.
Closes the speed differential between the commercial vehicle and approaching traffic from behind.
Heavy vehicles require significant time and distance to reach highway speeds; prompt acceleration prevents trailing traffic from having to brake abruptly.
5
Check rear-view mirrors to assess trailing space cushions.
Confirms following traffic has adjusted safely behind the trailer.
Monitoring the rear space cushion ensures the vehicle has safely integrated into the active traffic stream.

Key Concept

Entering and crossing multi-lane traffic in a heavy commercial vehicle requires judging large gaps in both directions, maintaining continuous acceleration across lanes without shifting, and matching prevailing speeds to manage space cushions.
Estimated Time:1m 30s
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Topics

Space to Cross or Enter Traffic

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