stop-go sign

Noun

 * 1) A semaphore-like signalling device positioned at a road intersection or pedestrian crossing to indicate when to drive, ride or walk, similar in purpose to a traffic light, often run by a person rather than automatic.
 * 2) * 1923: The Appian Way of America
 * Something practical in the way of uniformity, for instance, would be an auxiliary sign attached to the stop-go sign indicating how a turn should be made.