When Did Directional Signals Become Mandatory In The US?

[espo]

8 hours ago, ChrisBcritter said:

Mopar must have kept them for the high-end cars - my '50 Plymouth had accessory turn signals; not even wired into the parking/tail lights but with separate lamps:

Those remind me of many of the after market turn signals of the day. Notice how the front turn signal is not part of the Parking Lights and the same in the rear. Many of my formative years were in the 'burbs of Chicago. I lived for a time in Wilmette in the early '50's. They had a city ordinance regarding any car left parked at the curb overnight. Even if it was your residence you were required to phone, remember there was no internet, the Wilmette Police Department with the information as to owner ship of the car and its exact location. They also required that the car have it's Parking Lights, I guess that's were the name came from, on all night until dawn. How many old 6 volt batteries do you think made it thru the night especially in subzero weather ??      

[Reegs]

Common belief here in NJ is that turn signals summon demons.