A lot of people insist that any highway projects always just induce demand, resulting in even more congestion, but the Big Dig did nothing of the sort. To this day, 30 years on, Boston traffic is still not as bad as it was pre-Big Dig.
Induced traffic does not mean that traffic on a specific place inevitably goes back to what it was before a new highway. It means that total traffic, including old and new infrastructure, always goes up if the total road capacity goes up.
Do you think the total car traffic in the Boston area today is greater than it would have been had the Big Dig not been built? If yes, the ‘infrastructure naysayers’ were correct.
Of course, this means new highways can be locally beneficial, for example when they are used to divert car traffic from a city center. But they still deepen the overall car dependency. Investing in rail-bound transportation while imposing heavy fees on car traffic into the city would likely be a better use of resources.