They do get closer to their rated volume than I expected, that’s true - I honestly expected the best would top out at 120dB even close up, just because these things are necessarily mounted within a few feet of the truck cabin and that would be physically painful already. But at least some truck horn manufacturers are almost living up to their claims (sadly). “Super bright” flashlight manufacturers still take the trophy for bad measurement. It also seems like “train horn” doesn’t really mean “a horn mounted on a train”, it means a horn that uses compressed air, so you will see train horns on trucks and cars.