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Increasing the number of lanes of traffic available increases the number of people who can get from A to B using that network during a specific time period.

Whether "congestion" increases or decreases is besides the point. Congestion is definitional in economically successful urban areas.

The trivial example is to imagine a theoretical road with free-flowing traffic and a 10mph speed limit. Add another lane and now twice as many cars can get from A to B (if the demand comes). No individual car will make the journey faster.

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