lmao I don't think I've ever heard anyone argue that it's legal, only that it's expected or that it's standard practice. but oh boy do people ever complain about how speed cameras would ticket people for going "only 5km/h over the limit in a school zone" (context: my province recently banned all speed cameras and took them all down. yes, all of them. it's dumb as fuck)

to add some clarity to my previous comment, I was thinking of a 60 km an hour stroad where it's designed for 80+ and you can comfortably drive 90 because it's two lanes each way with shoulders, divided, and a separated sidewalk that nobody uses because it's unpleasant as fuck. in that case, driving 65 in a 60 is just.. it makes no difference. the road is designed for 80.