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The goal of building new roads is to decrease congestion and reduce travel times.

If you build a new road and it gets just as congested and it takes just as long to travel from A to B, then what did you accomplish?

The number of people who want to use a road is not the metric we're trying to optimize here. If we wanted to do that we should build as few roads as possible. Then there would be tons and tons of people who want to use each road. Hooray! Success!