I don’t live in Houston, but around here, my observation is that most traffic issues are caused by three things.
1) Equipment failure/malfunction/disuse (no brake, stop, turn signals, or the inability to use them)
2) Improper lane usage - failure to stay right, failure to yield the right of way.
3) Poor maintenance. Bald tires, atrocious alignment (or lack of it), worn brakes.
But I never see the police going after these types of drivers, even though anyone driving sees them everywhere.
Make that four things
4) Driver distractions. Kids, cell phone, putting on makeup, reading the newspaper, texting, whatever.
A woman almost rear-ended me this morning. She was on a cell phone and reading a book(!) while driving. I can’t help but admire her a bit - she must have some skillful legs with which to drive as her hands weren’t available.