They don't do that in the US. On the other hand, in Canada, they do say "temperatures will be in the teens this morning" all the time on the radio without elab

They don't do that in the US. On the other hand, in Canada, they do say "temperatures will be in the teens this morning" all the time on the radio without elaborating further. But...since you brought it up, I also find it's much easier to get in the appropriate lane when the exits (etc) are indicated one mile in advance (~1 minute driving time) than 1 km (~30 seconds). 2km warning would be fine too, but since it's not a round number, they tend not to be signed that way....