Final answer:
City or county employees driving a commercial vehicle on official duty must generally have a commercial driver's license (CDL), with specific requirements varying by local and state laws.
Step-by-step explanation:
A city or county employee driving a city or county owned commercial vehicle while on official duty is typically required to have a valid commercial driver's license (CDL). This is because commercial vehicles usually have different requirements due to their size, type of cargo, or the number of passengers they can transport. These regulations are in place to ensure the safety of the driver, the vehicle, and other road users. The requirements for a CDL and any additional endorsements depend on municipal and state regulations as well as the specific duties associated with the employee's position and the type of vehicle being operated.