New studies from Germany and Hong Kong pinpoint specific sources of light pollution keeping our cities excessively bright at ...

After passing a Dark Sky ordinance to curb light pollution and save energy, Pittsburgh is installing adjustable streetlights.

Residents in the Eckington neighborhood of Northeast DC told 7News they are worried about their safety and traffic congestion ...

For decades, emergency vehicles have been able to change traffic lights to green. Their strobe lights and sirens can activate traffic signals to give them the right of way, but the new technology ...