What professions, if any, should be required to speak English?

Context: I work somewhere that gets deliveries on 53 foot enclosed trailers. We don’t have a dock so theres a specific way we have to have them park. Nothing crazy just they usually try to back in to our phone booth of a parking lot and we tell them to park on the street on the curb. Sometimes they have a machine that can be driven and they don’t have ramps so they have to call a flatbed tow truck.

Well when they can’t speak English. They get very frustrated when we say we can’t unload them there. They call their broker and they usually have to translate. Now it is my understanding that the DOT requires them to be able to “communicate in English” mostly for law enforcement.

So the question remains are there professions that should be required to know English or at bare minimum be able to ACTUALLY communicate in English in order to be able to perform their job responsibilities?