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Question:

If you must stop on a road or the shoulder of a road, you must set out your warning devices within _________.

A 10 minutes.
Explaination

Within 10 minutes of stopping, federal requirements require you to set out your emergency warning equipment (such as reflective triangles). Federal requirements also specify where your warning devices must be mounted in relation to your vehicle. For more information, see Section 2.5.2 of the Wisconsin Commercial Driver's Manual. [49 CFR 392 .22]