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.
As more cars enter a crowded road, drivers have to use their brakes to avoid collisions, creating a traffic wave. A traffic wave occurs when cars slow down, and the slowing trend continues backward -- like a domino effect.s more cars enter a crowded road, drivers have to use their brakes to avoid collisions, creating a traffic wave. A traffic wave occurs when cars slow down, and the slowing trend continues backward -- like a domino effect.