There are now variable speed limit signs too. Example... https://www.aspentimes.com/news/speed-limit-on-i-70-through-glenwood-canyon-to-range-from-30-60-mph-d

There are now variable speed limit signs too. Example... https://www.aspentimes.com/news/speed-limit-on-i-70-through-glenwood-canyon-to-range-from-30-60-mph-depending-on-conditions/ https://www.aspentimes.com/news/speed-limit-on-i-70-through-...