What should a sanitation worker check for during a vehicle inspection?

During a vehicle inspection, it is crucial for a sanitation worker to check for puddles of fluid and burnt-out lights. These indicators can reveal significant issues with the vehicle's mechanical function or safety. Puddles of fluid might suggest leaks from critical systems such as the engine, brake, or transmission, which could lead to operational hazards if not addressed. Burnt-out lights can impair visibility for the driver and make the vehicle less visible to others on the road, increasing the risk of accidents.

The other options do not encompass the essential safety checks needed. Checking only the gas level is inadequate because it misses other important factors that ensure the vehicle is in safe working condition. Uniform cleanliness might be a consideration for aesthetics or hygiene but does not directly affect safe operation. Lastly, monitoring the presence of volunteers in the vehicle does not relate to the mechanical or safety checks a sanitation worker needs to perform, making it irrelevant for a vehicle inspection. Focusing on fluid leaks and lights is crucial for maintaining safety and operational efficiency in sanitation work.