This is really long-term trend. First they thought at would plateau at 1 car per household, then 2 cars per household, then 1 car per licensed driver, and as i

This is really long-term trend. First they thought at would plateau at 1 car per household, then 2 cars per household, then 1 car per licensed driver, and as it blew through all those "round numbers" (in the US) no one really knew where it was going to stop. Cars per capita (or per household or per driver) peaking is a big deal even if population doesn't peak for another few decades.