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Difficulty: HardAccident Procedures

A tractor-trailer is immobilized in the travel lane of an undivided two-way roadway following a collision situated immediately past a sharp curve where sight distance from the rear is restricted to under 500 feet. In accordance with standard commercial driver accident procedures and federal safety regulations, how should the driver deploy the three reflective emergency triangles?

  1. A
    Place one triangle 10 feet behind the vehicle, one triangle 100 feet behind the vehicle, and one triangle 200 feet behind the vehicle, all facing traffic approaching from the rear.
  2. B
    Place all three triangles spaced at 50-foot intervals along the center line beginning 10 feet ahead of the front bumper toward oncoming traffic.
  3. Place one triangle 100 feet ahead of the vehicle, one triangle 10 feet behind the rear corner, and relocate the rear warning triangle back 100 to 500 feet before the curve to provide advance warning.Answer
  4. D
    Place one triangle 100 feet ahead, one triangle 100 feet behind, and keep the third triangle mounted on the vehicle's rear door frame.

Answer

Place one triangle 100 feet ahead of the vehicle, one triangle 10 feet behind the rear corner, and relocate the rear warning triangle back 100 to 500 feet before the curve to provide advance warning.
Under standard commercial motor vehicle safety procedures, stopping on an undivided two-way road requires placing warning devices 100 feet ahead toward oncoming traffic and 10 feet behind the rear corner. When view is obstructed by a hill or curve within 500 feet, the rear-most device must be moved back 100 to 500 feet to give approaching drivers ample advance warning before entering the curve.

Step-by-Step Solution

1
Identify the roadway configuration and traffic flow directions.
The roadway is an undivided two-way road, which requires warning devices placed to alert traffic approaching from both the front and the rear.
Traffic moves in opposite directions on undivided roads, necessitating bi-directional warning protection.
2
Evaluate sightline restrictions caused by the sharp curve.
Because rear sight distance is obstructed within 500 feet, the standard 100-foot rear placement is inadequate.
Approaching drivers need sufficient reaction distance before entering the blind curve.
3
Apply federal emergency device placement rules for obstructed views.
Deploy one triangle 100 feet ahead of the vehicle in the oncoming lane/shoulder, one triangle 10 feet behind the rear corner to outline the vehicle footprint, and move the third triangle 100 to 500 feet back down the road before the curve.
This configuration satisfies both bi-directional warning mandates and sightline obstruction requirements under CDL safety standards.

Key Concept

Emergency reflective triangle placement for obstructed sightlines on two-way undivided roads
Estimated Time:2m 0s
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Topics

Accident Procedures

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