I think it might be good to have a way to mark dangerous curves or intersections. I live on a "dead-man's curve" where we routinely have accidents when it is wet or icy or on holidays when people drink & drive. See this link: https://www.facebook.com/media/set/?set=a.1074814064629.2013582.1054524325&type=1&l=eb11fcdbee

I think people might be interested in knowing to be more alert in certain areas.