They discourage people from driving unnecessarily, which saves on fuel and emissions.
Well, it’s not clear. The major concern is whether lots of drivers would choose to take a longer route (thus using more gas) than take a toll road, but that depends on how much the toll is, how long the alternate route is (maybe it’s even shorter) and how much money people have to spend on tolls vs. the cost of gas. There’s really no way to know until someone does a study. Ideally they encourage carpooling, but, again, there’s no research to suggest they do or do not.
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