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Question

Difficulty: MediumDriving in Fog

Visibility on a divided highway has deteriorated to near zero, making continued travel hazardous. In what sequential order should a driver execute the procedure to safely exit traffic and park the vehicle according to standard commercial driving safety guidelines?

  1. 1Signal intention well in advance and smoothly decelerate while avoiding auxiliary engine retarder engagement on damp pavement.
  2. 2Steer completely off the active roadway and shoulder into a designated truck stop, rest area, or off-highway parking lot.
  3. 3Bring the commercial combination to a full stop within a parking space, set the parking brakes, and shut off the engine.
  4. 4Extinguish the forward driving headlights and ensure four-way emergency flashers are illuminated.

Answer

The proper sequence is: signal and decelerate gradually without using engine retarders, guide the vehicle completely off the roadway into an off-highway parking facility, secure the vehicle in a designated stall with parking brakes set, and finally turn off headlights while activating four-way emergency flashers.
The correct sequence begins with signaling and controlled deceleration on slick pavement without engine retarders, followed by completely leaving the roadway for a designated parking facility, setting the parking brakes, and extinguishing headlights while leaving four-way flashers on to prevent rear-end collisions.

Step-by-Step Solution

1
Signal early and reduce vehicle speed gradually without engaging auxiliary retarders.
The vehicle slows under full traction control without wheel lockup on damp pavement and alerts trailing traffic.
Fog produces condensation on the road surface, making aggressive braking or retarder use dangerous while slowing down.
2
Exit the highway into a rest area or truck stop rather than stopping on the road shoulder.
The commercial vehicle is removed entirely from active traffic flow.
Stopping on highway shoulders during dense fog creates a high hazard of being rear-ended by wandering vehicles.
3
Park in a designated stall, engage parking brakes, and shut down the engine.
The vehicle is physically secured in a safe holding area.
Mechanical parking brakes ensure the vehicle remains stationary.
4
Shut off forward headlights and leave four-way hazard flashers operating.
The vehicle is visible without presenting false headway cues.
Headlights left on can lead disoriented drivers to track the lights and collide with the parked vehicle.

Key Concept

Discontinuing travel and executing safe parking protocols in dense fog
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Topics

Driving in Fog

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