[rmtech]

> Were it not for the roads, the people would live in denser development

All other things being equal, without the roads people simply wouldn't have a place to live at all and would have to live and work somewhere else. See e.g. the SF Bay area for an idea of how bad things can get housing-wise.

But really the problem is that local laws artificially constrain the supply of housing. However it's not fair to blame that on road-building. The solution to a lack of housing is to build more houses (it's astonishing that one has to keep repeating this over and over and over again)