A delay on the MBTA because of a "signal problem" is a regular occurrence. But for many MBTA riders, what that means is a mystery. Simply put, the signal system is "the intelligence that helps trains ...

Drivers experience billions of dollars in congestion costs at intersections every year. Improving traffic signal timing could help reduce costs and delays. Sometimes you sit in your car at a traffic ...

Drivers experience billions of dollars in congestion costs at intersections every year. Improving traffic signal timing could help reduce costs and delays. Sometimes you sit in your car at a traffic ...

Q: What are the rules about crosswalks at intersections with signal lights? Many people think that if they are in a crosswalk and the light is green for the automobile, they can still cross. Please ...