A version of this article first appeared in the Virginia Mercury. Just as speed limits set a maximum velocity for drivers, so too the commonwealth establishes a minimum speed limit for localities. Currently, any city or county looking to slow traffic in a busy shopping district or on a quiet residential street can go no lower than 25 mph. A bill passed during this year’s General Assembly session, however, would change that, permitting posted speed limits to drop as low as 15 mph. A ten miles per hour difference may not seem huge, but for pedestrian safety advocates and the families of victims of traffic collisions, the change could mean the difference between life and death.