Â© PMA of Georgia 2010. Venting. This concept of the plumbing system breathing (while. conceptually accurate) is somewhat confusing to a. craftsperson when trying to understand specifically what. the purpose of the vent system is.
Definition of traffic jam. : a situation in which a long line of vehicles on a road have stopped moving or are moving very slowly stuck in a traffic jam.
The simplest traffic light comprises either a single or a pair of coloured aspects that warns any user of the shared right of way of a possible conflict or danger. 1  Flashing red: treated as a stop sign. 2  Flashing yellow: caution, crossing or road hazard ahead. 3  Flashing green: varies among jurisdiction.