It is fairly well documented that demand for road travel DOES work this way though and is different than demand for health care, waste disposal, and the internet. [0] There is strong evidence that building additional roadway capacity does not decrease travel time in the long run. Whether or not increasing the throughput of the roads is the best way of enabling mobility or the best way to design a city is a judgment call, but it is fairly clear that simply adding roadway capacity does not solve congestion.

Would be interested in seeing any evidence to the contrary if it exists.

[0] https://www.researchgate.net/publication/315534829_Closing_t...