As city leaders urge drivers to slow down in urban areas, speeds on highways have steadily risen. Here's how speed limits are set and why.

What if the equation that controls most speed limits in America was established for rural highways nearly a century ago? That is the uncomfortable truth facing transportation engineers and ...

In the early 1940s, traffic got so heavy in and around Twin Falls that Police and Fire Commissioner O.H. Coleman asked the City Council to install a blinking yellow light at Addison Avenue and Locust ...