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jarledb: Somewhat related: If you are wondering if swapping in and out of lanes when its congestion on the road will get you there faster, you should watch the Mythbusters test:
http://autos.aol.com/article/is-it-faster-to-weave-in-and-out-of-traffic-or-stay-in-one-lane/
This really has reduced a lot of stress for me. Knowing that weaving in and out of traffic actually doesn't make a big difference (other than raising your stress levels) really is nice knowledge to have. Got to see it in practise in horrible Auckland traffic last time I was there, was fun to see how little help it was for the typical BMW and Audi drivers to practise their slalom lane swapping..
And when you consider that the lane swapping actions potentially cause ripples through the traffic that end up affecting everyone, I think it's better usually just to chill and plod along in a single lane.
