When an aircraft's engines are being operated vehicles will not be operated?

When an aircraft's engines are running, it creates a hazardous environment due to the potential for jet blast, noise, and exhaust fumes. This necessitates strict safety protocols that prohibit the operation of vehicles in the immediate vicinity of the aircraft. Ensuring no vehicles are present helps protect personnel and equipment from accidents and injuries. Therefore, vehicles are typically kept at a safe distance until the engines are shut down.