One of the major problems with cars is the terrible lack of density. Per-occupant, a car occupies more space on the roadway than any other form of passenger transport. And as cars get larger, that lack of density gets even worse. There's only so much space on the road, so something has to give.

Have you ever tried to park an SUV versus parking a sedan?

Here the large SUVs make everyone else drive slower in the city, because they're so big the driver has poor visibility and thinks they need several feet more than they do in clearance, and so drive almost in the middle of the road. Others then have to go real slow to not get dinged up on either side.

Here's a helpful comparison https://www.carsized.com/en/cars/compare/opel-astra-1998-cou...

You have a fixed amount of space to put stuff. If the stuff gets larger, can you put more or less stuff in that space?

So now we have at least the same number of people trying to put their stuff in that fixed size space, but their stuff got bigger, does that make it easier or harder for them to put their stuff in that space? Will they have to compete more or less for that space?

Seems like a pretty obvious one to me.

fewer cars per foot, less visibility, etc? If there's a sedan in front of me I can see whats going on, if there's a UPS box truck, i cannot even see the light 150 feet away.