What color warning lights are used by postal service vehicles?

Postal service vehicles are equipped with amber warning lights to signal their presence and alert other drivers on the road. Amber lights are typically used for vehicles that are engaged in work operations, like postal carriers who may be making frequent stops to deliver mail. The use of amber lights is designed to enhance visibility while still indicating that the vehicle is not necessarily responding to an emergency. This distinguishes them from other colors like red and blue, which are typically reserved for emergency vehicles, such as police, fire, and ambulance services. Instead, the amber lights serve a crucial function in maintaining safety and ensuring that other drivers can react accordingly when postal vehicles are operating on public roads.