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Credit: AP/Jeremy Little

Red, yellow, green … and white? Smarter vehicles could mean big changes for the traffic light

Drivers pay less to DC for red-light camera tickets after tweak, but no refunds planned

Md. bill wants drivers seeing more yellow, not red at traffic lights

Traffic signal upgrades could speed up buses, emergency vehicles in Fairfax Co.

D.C. to audit traffic system security vulnerabilities

Hacker: D.C. traffic system vulnerable