Earlier quoted context omitted.
> Adding in a new road can actually increase traffic as it ends up encouraging more people to drive who otherwise wouldn't have. You're alluding to "induced demand," which does not claim that adding a new road increases traffic. When it becomes "cheaper" (in terms of time) to drive, more people will start driving, but the cost of driving (time to get from A to B) still goes down. This is basic economics, except with…
Your logic is present in a lot of economic thinking, but it is flawed as it assumes people are purely rational actors that make decisions at the margins. That is a classic Economics 101 assumption that turns out to only be true in theory. In reality people are stubborn. We chase sunk costs and we repeat inefficient behavior because it is habit. People therefore won't necessarily choose to drive based on an evaluation…
https://www.thecgo.org/wp-content/uploads/2020/10/Can-We-Bui... (Pages 8-10)