Transportation

An underground electric railroad system, typically found in large cities, used for public passenger transport; in North America it can also refer to an underground pedestrian walkway crossing under a road or railway.

An electric passenger vehicle that runs on rails, typically along public urban streets, used for local public transportation.

An adaptive traffic signaling device that uses sensors, artificial intelligence, and real-time traffic data to adjust signal timing, reduce congestion, and improve road safety.

public road, public street