What looks to most as the lane open or closed light at what use to be a bank in Lebanon PA is actually reusing a old style train order signal called a semaphore.Very simple concept ,with a single light bulb it could light a red yellow or green lens.And the head assembly moved to change lens position and with it caused the arm to move thus being usable in that way.PING: to see one in action http://www.pbase.com/mad_monte1/image/57114993