You're talking about "induced demand". Induced demand is not so high for housing. I might decide to drive 15 minutes to get a hotdog from Costco is the traffic isn't too awful. I probably won't buy an extra house just because it looks like a better deal than before. It does exist to some extent, but it's nowhere near as big a deal as for roads (at least in the short-medium term), at least I think that's the currently thinking on it - https://appam.confex.com/appam/2018/webprogram/Paper25811.ht...