A stop sign is a universal symbol, but there’s an entire manual of traffic rules written for cities to follow — and it’s under intense scrutiny. Planning consultant Angie Schmitt joins host Krys Boyd to discuss the Manual on Uniform Traffic Control Devices, why everything from bike lanes to rainbow crosswalks is codified inside it, and why many argue it needs an update. Her article, published in CityLab, is “Let’s Throw Away These Rules of the Road.”