Good points. Yeah, as the cost of travel goes up, people make various decisions: bite-the-bullet, find alternatives, delay, consolidate, and/or go without. As the cost decreases, the incentives to find alternatives, delay or consolidate trips goes down (which means roads are then used for less important reasons and less efficiently - why go to the grocery store once a week if you can go every day in half the travel time?)
I would agree, at some point when all alternatives are equally unattractive (or non-existent), then going without is a more attractive option.
Though, the "consolidate" option is a big one to consider. Rather than going to the city every day, perhaps people could do so every other day for the same benefit. If traffic is bad, then people will go less often (frequency of travel is a function of cost). Thus, in some cases, highway expansion is filled by people that want to go to the grocery store every day rather than going once a week. Meanwhile, those that commute to work, are still going to do so because they have to. If the commute gets too bad, then some people will decide to move.
On the other side of the spectrum, at some point there are so many people that want to go into the city every day - you can't do it with single occupancy vehicles and roads. It's a scaling problem. For example, someone did an analysis of parking decks in Seattle and whether there were not enough of them. They found if there were all filled and everyone then tried to leave - it would take 2 days for all the vehicles to exit the city.
I would agree, at some point when all alternatives are equally unattractive (or non-existent), then going without is a more attractive option.
Though, the "consolidate" option is a big one to consider. Rather than going to the city every day, perhaps people could do so every other day for the same benefit. If traffic is bad, then people will go less often (frequency of travel is a function of cost). Thus, in some cases, highway expansion is filled by people that want to go to the grocery store every day rather than going once a week. Meanwhile, those that commute to work, are still going to do so because they have to. If the commute gets too bad, then some people will decide to move.
On the other side of the spectrum, at some point there are so many people that want to go into the city every day - you can't do it with single occupancy vehicles and roads. It's a scaling problem. For example, someone did an analysis of parking decks in Seattle and whether there were not enough of them. They found if there were all filled and everyone then tried to leave - it would take 2 days for all the vehicles to exit the city.
There are certainly many aspects to consider.