>>1981867Induced demand applies to mass transit as well. When New York City built their subway, they were shocked to observe that the subway exceeded ridership projections without meaningfully reducing passenger traffic on the elevated lines which it had been intended to replace.
The difference is mass transit's capacity for scaling and its travel times being less affected by congestion.
The general principle is the Jevons Effect (or Jevons Paradox) where improvement in the efficiency with which a resource can be used leads to more usage of that resource.
