Don't increase road capacity, people will start biking, or getting scooters, or taking public transit. High density also generally means you have groceries and

Don't increase road capacity, people will start biking, or getting scooters, or taking public transit. High density also generally means you have groceries and restaurants near your house so you don't need to drive to eat. If you increase road capacity, demand just rises to meet it until it is congested again. The point is to find other solutions. I would say that not building is short term thinking. Workers and companies will leave the area. I would also argue that housing had little to do with silicon valley's success. That was access to large amount of tech workers (universities in the area) and lots of government research money.