Which of the following is NOT a requirement for obtaining a DOT number?

To obtain a DOT number, a key requirement involves the nature of the commercial operations being conducted. Specifically, the correct answer highlights that maintaining a gross vehicle weight rating below 10,000 pounds does not necessitate a DOT number. The Department of Transportation primarily requires a DOT number for vehicles used in commercial activities that exceed this weight threshold or for vehicles utilized in interstate commerce, regardless of weight.

The requirement of operating vehicles across state lines is crucial for obtaining a DOT number, as it directly relates to the regulatory oversight by the DOT concerning interstate transportation. Completing the Motor Carrier Identification Report is a procedural necessity for those seeking a DOT number, as it provides essential information about the operating entity. Additionally, being a registered commercial entity is fundamental since the DOT number is designated for commercial operations rather than personal or non-commercial use.

Thus, it's clear that the weight rating in question is the factor that distinguishes whether a DOT number is necessary, confirming that maintaining a gross vehicle weight rating below 10,000 pounds is NOT a requirement for obtaining a DOT number.