Definitions for "TRAFFIC LIGHT"
a visual signal to control the flow of traffic at intersections
A signal light used on highways, especially at an intersection to regulate movement of traffic. A traffic light may be set to operate as a blinker but is usually fixed, alternating red and green (and frequently including yellow as a transition between green and red) indicating stop and go (and caution).
A traffic control device that is operating and shows at least red and green in sequence. Two or more such traffic control devices at an intersection shall be counted as a single traffic light.
Keywords:  brainless, machine
a Brainless Machine
a very objective statement and often with serious consequences if not heeded---but only in that system
Keywords:  absolute
an absolute, rather, to traffic
Keywords:  good, protocol, example
a good example of a protocol
Keywords:  flow, example, control
an example of flow control