I have to disagree with your assessment of vehicle utilization. Maybe where you live cars are underutilized, but in my (poor) part of the country, vehicles get

I have to disagree with your assessment of vehicle utilization. Maybe where you live cars are underutilized, but in my (poor) part of the country, vehicles get drove until they are scrap heaps, I don't see how you can expect more utilization out of a car that gets drove for 400,000 miles. Yeah sure, more passengers could help, but only if you were going to drive to the same location without them anyways, and only if the timing matches up. People do ride share to work if it is far enough away and we even have mini parking lots for that purpose, but unless you work at the same place or next door with the exact same schedule it would be an even bigger waste of time for poor individuals who are already constrained by time to slit it up even more. And it's not like a car rots away because you don't drive it 24/7 with full passengers either.