08-12-2014, 06:37 PM
I've seen them done manually. There's a circuit that blinks back and forth by flipping a switch. I would imagine that the NJ International signals do the same, just change the interface to activate.
Mike Kieran
Port Able Lines
" If the world were perfect, it wouldn't be " - Yogi Berra.
Port Able Lines
" If the world were perfect, it wouldn't be " - Yogi Berra.