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 ...

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 ...

Speed limits are a subject of constant discussion across America, and because of decentralized state regulation over the limits, there can be a wide variance in limits from state to state. Arizona, ...