The U.S. Department of Energy has released a GATEWAY report on the experiences of the City of Portland, OR, in converting its street lighting from high-pressure sodium to LED. Such large-scale conversions are rarely simple matters, and the Portland Bureau of Transportation was an early investigator of LED street lighting and one of the first public agencies to join DOE's Municipal Solid-State Street Lighting Consortium, so learning how the city addressed the challenges it encountered can be especially helpful to other cities that are implementing or considering their own lighting transitions.

U.S. city Portland has installed blue LED lights next to red traffic lights at a six-way intersection to notify cyclists their bicycles have been detected, and traffic light will be changing soon to allow them pass through, according to a Oregon Live report.