Which of the following statements is true regarding CMV drivers?

The statement that CMV drivers must have a valid medical certification is true because federal regulations require all commercial motor vehicle (CMV) drivers to maintain a valid medical certificate to ensure they meet the necessary health and fitness standards for safely operating large vehicles. This certification verifies that a driver does not have any medical conditions that could impair their ability to drive and that they can perform the necessary duties without compromising safety.

Medical certification typically involves a comprehensive physical examination conducted by a certified medical examiner. The exam checks various health aspects, including vision, hearing, cardiovascular health, and other factors that may impact driving ability. This certification is a fundamental aspect of maintaining safety on the road and is a legal requirement for anyone wishing to operate a CMV.

The other statements do not adhere to the regulatory framework governing CMV drivers, which emphasizes the importance of medical fitness for safe driving practices.