The Washington Metropolitan Area Transit Authority (WMATA) announced Tuesday that its Automatic Train Operation (ATO) is set ...

Automatic train operation used to be standard for more than 30 years on all Metrorail lines until a deadly crash in 2009. It ...

ARLINGTON, Va. (7News) — Metro officials will begin automating trains on the Green and Yellow Lines on Friday after approval ...

Sometimes we get green lights, and sometimes we hit all the red lights on our commute to work. But, while sitting at a red light, have you ever wondered why traffic lights are red, yellow ...

Potts’s prototype cost $47 to construct and featured three lights: red, yellow and green. The yellow light signalled drivers to slow down and prepare to stop. Potts’s invention, which became ...

Eventually, the upgrades could do away entirely with the red, yellow and green lights of today, ceding control to driverless cars. Henry Liu, a civil engineering professor who is leading a study ...

Why the traffic light colors were chosen There are a few reasons why the colors red, yellow and green were chosen for traffic lights. Red is an obvious choice. The color red means danger or to be ...