Historical Marker
Vallandigham's Speech, 1863
Historical marker location:
Mount Vernon, Ohio
( Marker is at the intersection of High Street (U.S. 36) and Public Square, on the left when traveling east on High Street.)
Marker installed: 2000
The first traffic light in the world was installed in Cleveland, Ohio, in 1914. It had only two colors, red and green, and was manually operated by a police officer.