Title text:
‘They really shouldn’t let those small cars drive in traffic. I worry I’m going to kill someone if I hit one! They should have to drive on the sidewalk, safely out of the way.’
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3167/


May Skeletor suggest: Regulation
regulation is why cars in the USA are so large. all the safety requirements pushed them larger and larger and heavier.
also the chicken tax is why our trucks must be large.
not USanian but afaik cars got so big over there because trucks (being work vehicles) have less (environmental, safety, …) regulations than cars, that’s why SUVs got so popular, manufacturers pushed them onto public. as long as the base for the vehicle is that of a truck they are legally exempt from many limits.
source: probably “Not Just Bikes” on y*utube idk
EDIT: just read about the chicken tax, interesting…