Honestly car size and driving under the influence probably has got more to do with this than observance of the speed limit.
Canada has the same vehicle size issue. Large pickup trucks/SUVs are similarly popular. Everyone here goes 15km/h over, unless there’s speed cameras which are only by schools.
I wouldn’t be surprised if impaired driving was a big factor, in Canada it’s the equivalent of a felony even if you don’t hit anyone. In the US it seems like people treat it closer to being a speed ticket.
