New York rates four common options.
The next generation of traffic signal technologies aim to take the guesswork out of intersections.
The city's inability to stop on red is shown in this wince-worthy highlight reel of 2013 crashes.
How Berlin's iconic Ampelmännchen were born and saved from destruction.
Amsterdam never stood a chance.
Stop? Go? Don't walk? Gaaaaah!
The green is only a second long.
The noPhoto is a license-plate frame that promises to get you out of traffic tickets.
Take a trip to the "dilemma zone," the strip of road where auto accidents are born.
Sure it makes travel easier. But that leads to more drivers on the road.
Think the battle between drivers, cyclists, and pedestrians is ugly now? Wait until engineers start designing intersections for computers instead of people.
The best responses from this week's The Big Fix