Since the 1950s, all stop signs in the U.S. have been required to be red, as outlined in the Federal Highway Administration’s Manual on Uniform Traffic Control Devices (MUTCD).

Baltimore City, MD — In addition to speed and red-light violations, Baltimore City now wants cameras to roll on your rolling stops. A newly passed state law gives the green light for stop sign ...

Unless you're from Michigan, the first image that probably comes to mind when you think of a stop sign on the hood of one of these cars is probably the ubiquitous red, eight-sided "stop sign" you ...