Emergency vehicles will be equipped with a transponder that can interrupt the normal operation of a traffic light. Emergency vehicles will get a green light while vehicles approaching from a cross ...

CU Boulder researchers have designed microscopic “racetracks” that trap and amplify light with exceptional efficiency. By using smooth curves inspired by highway engineering, they reduced energy loss ...

If you’ve been to a wedding or a downtown coffee shop in the last 10 years, you’ve probably seen those little lightboxes that ...

After an 11-year-old was killed by a car at a San Carlos intersection last October, the city installed stop signs that drivers have frequently been blowing through, records show. Why it matters: The ...