On the curvy road that descends from my house to work, cracks in the blacktop have been repaired with squiggly lines of tar. They seem slick. I try to avoid them but I hit them inevitably. Thankfully the lane going up is much freer of tar. Is there any standard that I should show to the road department in my county in an effort to have them resurface the road? Any anecdotes, statistics or studies? It just feels dangerous.