system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: why aren’t busses designed to be more aerodynamic, like cars and SUVs?
gpt
Because they don't tend to move at high speeds so aerodynamics are less important and square shaped are better for packing more passengers into, you can't put seats under a sloping roof.

Coaches or long distance buses fall in the middle so do tend to be a bit more aero.