The role of the US Department of Transportation is to ensure the safety of the public and of the drivers that work on the roads.
One way that the US DOT implements driver safety is to require that drivers do not stay out on the roads too long, drive without breaks, and they must carry a required log book.
Log books are only used when, in general, a commercial motor vehicle is used as part of a business and is involved in interstate commerce and fits any of these descriptions:
Most oxygen providers will fall under this category because they carry 1,001 lbs. of oxygen (that's the tanks and the gas) and therefore must use placards.
However, even if you placard you will be exempt from the log book requirement if your drivers don't drive farther than a 100 mile radius from the work place, and they don't work longer than 12 hours. (49 CFR 395.1 (e))
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