There is another reason. Boredom. My stretch of driving is usually in moderate to heavy traffic, and either you drive 70mph in a very monotonous way, or you drive 45-65 following cars and even without really being able to change lane because the highway is loaded. There is very little driving skill required to drive except paying attention. And of course with phones, people don’t pay attention anymore...

That’s why autonomous highway driving can’t come fast enough, it would make everyone much safer.