Efficient traffic management in urban areas remains a significant challenge as vehicle density grows and infrastructure ...

The traffic light in Syracuse, N.Y.'s Tipperary Hill has the green light on top. Irish residents thought red on top ...

There's nothing more annoying than sitting in a traffic jam, watching the clock tick away. But the days of getting stuck in congestion could be a thing of the past - if cities added a fourth colour ...

Some things are so ubiquitous that it's easy to forget they're designed for a reason. With more than 300,000 traffic lights set up across the United States, it's easy to take how they look for granted ...