&gt; Once autonomous vehicles become prevalent, traffic volume should drop<p>That&#x27;s simply not true; not only will SDCs create &#x27;empty miles&#x27; of 0-passenger cars, but they will make people more comfortable with longer commutes (you can sleep on the way to work now), and with average commute getting longer we&#x27;ll get more passenger-miles.<p>Sharing won&#x27;t really pick up (except on the low end, displacing public transport) because SDCs are pretty cheap as is, and people generally prefer their personal space unmolested by others.