Directly for sign chasing, I doudbt it,
although the old (1987) school bus sitting
in the yard for storage, has a motor/contactor thing for the blinking lights as a schoolbus has.
To date still, the same sort of technology is used in the timers for appliances.
Of note, in high school, the shop teacher had
a little sign board with such a motor, and
the students got to dismantle the old scoreboard, which had appliance timer like motors/contacts for the timers and such
that are on a scoreboard .
