Each metro line usually has its own color on the map. For obvious reasons, these colors should be maximally different. Suppose a new metro line is built. We now explain a strategy to choose the color ...

CHICAGO (CBS)-- Wednesday is red-letter day at the CTA - 25 years since the CTA first began using color-coded route names on the 'L.' It's as simple as black and white: the 'L' is part of the fabric ...

CHICAGO (WLS) -- ABC7 is on the streets, answering your traffic and transit questions. A few people asked Roz Varon about the names of the CTA's transit lines. When did the names convert to colors and ...

With eight more transit lines set to be operational in less than 10 years, the Los Angeles County Metropolitan Transportation Authority, faced with using subtle color shades such as olive, pink and ...