Highly unlikely.  We&#x27;ll probably be able to get twice the usage out of existing roads because the distance between cars will shrink dramatically.<p>In my cynical opinion SDCs will likely precipitate a ten year pause in new road construction as drive times drop dramatically.  But at some point we&#x27;ll catch up to the additional capacity and spend another five or six years suffering as roads are built and expanded.<p>But the newly constructed roads will be more efficiently utilized than roads at present, so it will be cheaper per passenger mile.