What citation indicates that a driver must not operate a vehicle if their ability is impaired?

The correct citation indicating that a driver must not operate a vehicle if their ability is impaired is Citation 392.3. This regulation pertains to the requirement for drivers to be able to control their vehicle safely. Specifically, it addresses the operator’s responsibility to ensure that they are in a proper condition to drive, free from any impairments that could affect their performance, such as fatigue or substance abuse.

The underlying principle of this citation is to promote roadway safety by ensuring that drivers are fit to operate their vehicles. This regulation falls under the larger umbrella of federal safety regulations aimed at reducing accidents caused by impaired driving.

The other citations, while relevant to various aspects of vehicle operation and driver qualifications, focus on different areas. For instance, Citation 383.5 pertains to definitions within the commercial driver's license (CDL) regulations; Citation 391.41 relates to physical qualifications for drivers, highlighting necessary medical standards; and Citation 396.9 deals with the inspection and maintenance of vehicles. Each citation serves its distinct purpose within the FMCSA guidelines, but only Citation 392.3 explicitly addresses the impairment of a driver’s ability to operate a vehicle safely.