Do first owners sell their cars because they become unusable or because they become unfashionable or some other reason?<p>In two car households does the second car primarily get purchased for use when the first car is sitting idle but just in the wrong location?<p>Might there be a change in ownership as a sort of &quot;buy-to-let&quot; system comes in where owners wouldn&#x27;t be able to buy an autonomous vehicle but afford it as they send the vehicle out to work doing deliveries&#x2F;taxiing people during the times they don&#x27;t need it?<p>It seems quite hard to predict how autonomous vehicles will change things; a lot of it will depend on regulations on how they&#x27;re manned - will a driver with a license still be required at all times? Will there be new licenses? Will autonomous vehicles have extra restrictions on their speed or which roads they use? Will there be protectionist laws to prevent them picking up and taxiing people? The surrounding legislation will probably be as important to the way the evolution of car use happens.