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 ...

DENVER (KDVR) — The speed limit on Interstate 70 in the high country will now change based on driving conditions, thanks to newly installed electronic signage. The signs have LED lights that allow the ...