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Traffic Signal Displays The typical displays of traffic signals are three round lights as follows: Steady Red ball: Stop before the white stop line Steady Yellow ball: Slow down and be prepared to stop Steady Green ball: Go when it is safe to do so. Many states have additional motor vehicle traffic signals to control traffic flow more efficiently. They may include: Steady Red arrow and Flashing Red arrow: Means the same as the steady red ball, but only for vehicles going in the direction of the arrow Flashing Red ball: Means the same as a Stop sign Steady Yellow arrow: Means the same as a Steady Yellow ball only for vehicles going in the direction of the arrow Flashing Yellow arrow and Flashing Yellow ball: Proceed with caution only for vehicles going in the direction of the arrow and proceed with caution in all directions with the yellow ball. Steady Green arrow: A protected "Go" movement in the direction shown. These signal displays vary from state to state, so if you are traveling outside your home state, investigate local regulations. CHANGING ROADS Just as our bodies and vehicles are changing, so are roadway designs and signage. Think about how much has changed and developed in the last 100+ years. Here are some road design milestones: 1911: A centerline is painted on a Michigan road. 1915: The first Stop sign appears in Detroit. 1920: The first three-color traffic signal is installed in Detroit. 1956: Construction begins on the Eisenhower Interstate System. 1966: Creation of U.S. Department of Transportation (DOT). 1967: First bike lane installed in Davis, CA. 1974: National maximum speed limit of 55 mph established. 1984: New York state passes first law requiring seat belt use. 2009: First double diamond interchange opened in Springfield, MO. 2016: Interim approval by Federal Highway Administration (FHWA) of bike boxes. AARP 44 ARE WE READY TO DRIVE? 3 1 2 3 5 6 4