Traffic towers have come and, more/less, gone ...
but their postcards live on!First up: a traffic tower in mid-town New York City.
Dating?
http://www.metropostcard.com/publishersm1.html ... Don't let that car fool you. The Metropolitan Postcard Club database offers 1928-1974 for the Manhattan Post Card Publishing Company.
Cheers,
/s/ ikeyPikey

What they look like today: mobile, and festooned with cameras:
