It has nothing to do with snow and ice. It has everything to do with travel speeds, vehicle size, and safe stopping distance over a vertical (crest) curve.
I can actually check this out when I'm in the office next week. Can you tell me where that photo was taken?
30 posted on 07/06/2019 7:29:57 PM PDT by Alberta's Child
("Knowledge makes a man unfit to be a slave." -- Frederick Douglass)