What does the "M" on a driver's license signify?

The "M" on a driver's license signifies a motorcycle endorsement. This specific designation indicates that the license holder has fulfilled the necessary requirements to operate a motorcycle legally on public roads in Utah. Obtaining this endorsement typically requires passing written and riding skills tests to ensure that the rider has the knowledge and skills necessary for safe motorcycle operation.

This endorsement is crucial because it not only shows that the rider is legally allowed to operate a motorcycle but also suggests that they have received proper training in motorcycle safety, which can help reduce the risk of accidents. In contrast, the other options do not accurately describe what the "M" represents on a driver's license. Motor vehicle operation is too broad and does not specify motorcycles, mass transportation endorsement is not relevant to motorcycles, and minor restrictions refer specifically to age-related limitations rather than motorcycle operation.