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Traffic Light Colors: Why Are Traffic Lights Red, Yellow and Green?
Auto Club History
History of California License Plates, by Anne T. Kent California Room, Anne T. Kent California Room Newsletter
San Francisco cable car system - Wikipedia
New york traffic 1920s hi-res stock photography and images - Alamy
The Decline in Police Traffic Stops Is Killing People - Bloomberg
Militant Angeleno Archives: (Street) Signs Of The Times
STOP for Stop Sign History
California's Porcelain Enamel Traffic Signs
Whose Streets? - Streetsblog San Francisco
New boulevard stop sign posted by Auto Club in intersection, 1925 — Calisphere