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General Knowledge · Communicating

If a driver must stop a commercial motor vehicle on the roadway or shoulder of a two-lane road carrying traffic in both directions, how soon must warning devices such as reflective triangles be put out, and where?

1.Within 10 minutes, with one device about 10 feet from the vehicle toward approaching traffic and one about 100 feet from the vehicle in each direction along the traffic lane or shoulderCorrect answer
2.Within 30 minutes of stopping, with all of the warning devices placed behind the vehicle only, regardless of which direction traffic happens to be approaching from
3.Within 10 minutes of stopping, but only if the vehicle itself happens to be transporting hazardous materials at that particular moment in time today
4.There is no federal timing requirement at all; warning devices only need to be placed sometime before the vehicle is eventually towed away from the scene

Explanation

A driver who stops a commercial motor vehicle on the roadway or shoulder of a two-lane road carrying traffic in both directions must put out warning devices within 10 minutes, placing one about 10 feet from the vehicle on the traffic side toward approaching traffic, and one about 100 feet from the vehicle in each direction along the occupied traffic lane or shoulder, under 49 CFR 392.22. This requirement applies regardless of cargo, so it is not limited to hazardous materials shipments, and the placement is specifically toward both directions of approaching traffic on this type of road, not only behind the vehicle. The 10-minute window is a real, specific federal timing requirement, not something left unaddressed by federal law.

Source: 49 CFR 392.22

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