Traffic to me is all about the flow. When you impede the flow, traffic gets worse. For instance. When public transportation stops to pick up a passenger in the middle of traffic. It impedes the flow. When an overloaded tricycle cuts faster moving vehicles, it impedes the flow. In merging traffic, when drivers would rather bully themselves into the merging lane instead of merging alternately (zipper), it impedes the trafic flow. And the worst example are the counterflowing vehicles. Counterflowing is the single most selfish thing a motorist can do.