My windshield washer fluid has a rating on the tin of -45C, so I bet you can think up a fix for that.
The roads that have those barrel protections, are restricted access roads. Pedestrians and bicycles not allowed. This means you can't exactly walk up and examine the items. You only notice them when you drive by. Someone could hit the barrel at 120km/hr and consider that to be normal.
Roads with lower speed limits, have fewer accommodations of that type. The rail overpass near me, on a secondary road, has no barrels.
Paul