Here are some of mycrazyhobby.com's favorite street sign and traffic signal-related videos.
Aiming and masking the 3M M-131 Traffic Signal (Part 1)
Aiming and Masking the 3M M-131 Signal (Part 2)
Tomorrow's Drivers 1954
This 1954 educational video by Chevrolet shows lots of street scenes, including some cool signs. Narrated by Jimmy Strwart.
Traffic Light Guy's Signal Collection
Car Pushing Another Off the Road
Acme signal at the very beginning.