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The reason why it doesn't matter how many lanes are added is because inconsiderate people stay in the "fast lane" until the last moment before their exit, slam on the brakes, cut across all lanes of traffic causing all other lanes to hit their brakes, and then they finally exit the freeway.
By causing traffic to slow down or stop just for a single instance, that traffic pulse will exist for minutes to hours later.
If people would choose the lane they need and stick to it, making minimal lane changes, traffic would flow much smoother. People don't care that their aggressive driving, while saving them 2 seconds, will cost thousands of people extra seconds on their commute.
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