While fueling a vehicle carrying hazardous materials, where must an attendant remain?
Correct answer: C. – At the nozzle, controlling the flow of fuel
The CDL manual directs the driver to shut off the engine before fueling a motor vehicle containing hazardous materials. Someone must remain at the nozzle and control the flow throughout fueling. Leaving the nozzle unattended would prevent an immediate response to an overflow, hose problem, or other unsafe condition.
Source: New Mexico Commercial Driver’s License Manual — § 9.6.7, “Refuel with Engine Off”

