What exactly would be the point then. Tell other drivers its below freezing? Odd.
How d'you get the "other drivers" idea - what wasn't said, but was implied is a red light
on the instrument panelIn Canada there would be little point as it would light up in October and not go out until April
However in its country of origin, we used to have patchy winter weather and the combination of temperature and humidity to give an ice-covered road could come and go several times in a journey so there was some point to it.