&gt; Author neglects to consider that carpool lanes could (and should) be converted to &quot;self-driving only&quot;, as a phased approach to increasing capacity.<p>That would <i>decrease</i> capacity for the rest of the road. Maybe you could allow single occupant self driven cars to <i>also</i> use the carpool lanes. But to move carpoolers out of the carpool lanes and make them exclusive for self driving cars will simply cause car poolers to stop pooling and will increase traffic.