Most of the US drives faster than the speed limit. It is unsafe to drive the speed limit if everyone is going 10-15mph over the posted limit. Assuming you know

Most of the US drives faster than the speed limit. It is unsafe to drive the speed limit if everyone is going 10-15mph over the posted limit. Assuming you know the context you clearly don’t makes you look like a jerk. Just because some places (like Australia) strictly enforce speed limits doesn’t mean everyone everywhere does.