Add Yahoo as a preferred source to see more of our stories on Google. An example of what variable speed limit signs look like above a highway in Washington. (Courtesy of the Washington State ...

The speed limit posted on roadside signs doesn’t always match what their phone or vehicle navigation system says. On a recent drive down State Route 89 from Tahoe City to South Lake Tahoe, several ...

Speed limits across Texas roads are about to get smarter. In an effort to make highways safer and more responsive to real-time conditions, state officials are beginning a wider rollout of variable ...

An example of what variable speed limit signs look like above a highway in Washington. Courtesy of the Washington State Department of Transportation When icy conditions led to a 133-car pileup on ...