Have you come across crosswalk signals that skip countdown numbers? We have. And it's scary. Fortunately, Walk San Francisco, a pedestrian safety advocacy group, can help you take action.

"We're hearing reports of bad ped countdown signals that skip to 0 several seconds too early. MTA is aware of this problem. If you see one please call 550-2736 (24-hrs) to report it," Walk SF notes on their Facebook page.

Stay safe, San Francisco.