As D.C. prepares to more than double the number of traffic enforcement cameras, Post readers asked for a primer on yellow lights and pedestrian crossings.

Q: Regarding the red-light cameras used at intersections to catch drivers running red lights, what is the law, precisely? At what point is a driver in violation? Can you continue through if the lig… ...

Red light, yellow light, green light foods. Lists are amazing tools. A simple exercise I use: I list foods in red light/yellow light/green light categories. It helps to gain clarity on what could ...

Research illuminates yellow-light "dilemma zone"Yellow-light times vary but typically last three to five seconds. The longer the yellow persists, the more likely it is that drivers will not stop ...

Unfortunately, the presence of red-light cameras at intersections might cause some people to speed up even more when they see a yellow signal in order to beat the red. Q.

State police answer motorists' questions in Ask a Trooper. This week's subject: Yellow lights, and what you're supposed to do.

Have yellow lights gotten shorter at intersections with red-light cameras? Several readers believe they have, and some point specifically to signals in left-turn lanes.

A new study finds that blue light, which was previously throught to disrupt sleep patterns, might not actually be that harmful.

Tale Of The 3-Second Yellow Light By Jaime Holguin June 12, 2003 / 3:59 PM EDT / CBS John Irving knew he had been caught.

Even Google and the Army are on board. But the danger is that labeling foods as “green,” “yellow” or “red” won’t really help us become healthier eaters — just guiltier ones.

As if red-light and speed cameras weren't already controversial enough, a recent discovery in Italy is sure to send all drivers over to the Hatorade stand. A programmer and 108 other individuals ...