SLC traffic is what it is.
But, the worst drivers in the world live in Pittsburg and Antioch, CA. They attempt to drive highway 4 but probably learned how to drive on computer games where there are no rules or laws. It's the only explanation.
Imagine driving 70 and getting freight-trained by a large number of cars all doing 95+. It's the only place in NorCal where there will be an accident, almost daily, prior to 5 am and sometimes prior to 4 am, when there isn't traffic. How can you get into an accident when no one is on the road?
I lived in LA and Orange County a long time and used to think that Los Angeles had the worst drivers. But this small section of highway takes the prize. The bad drivers in LA don't even come close.