Good public transit does not mean less wear and tear on the roads, absolutely not. As I stated in a different comment, a bus that replaces 10-20 cars causes similar road damage as 10000 cars. Which is fine, but for completely different reasons. Public transport is good because it allows more pedestrian-friendly cities, reduces pollution, etc; just road wear and tear is not one of the reasons why it’s good, it’s one of the drawbacks.