Question: "Why is there a 'No turn on red' posting (heading north) at Orange Grove (Road) and Skyline (Drive)? It is a seemingly wide and safe intersection with visibility for miles when looking toward the west for oncoming traffic. The next intersection at Campbell and Skyline does not have such restrictions, and it is a seemingly busier and more dangerous (less visibility) intersection. Sometimes if we know the reasoning, we can appreciate and respect the restrictions!" Karen Nelson wrote.

Answer: The Pima County Department of Transportation doesn't allow right turns from red at any intersections with double right-turn lanes, said Priscilla Cornelio, director of the department. The vehicle in the left-most right-turn lane can block visibility for the one in the right-most right-turn lane. The county does the same at dual left-turn intersections, she said.

There was an average of one crash every three months when turns were allowed on red there, Cornelio said. Since the restriction was put in place, there have been no right-turn-on-red collisions, she said.