Earlier quoted context omitted.
Supposing autonomous cars actually drive extremely safely and this results in them going 20 km/h under the speed limit. Are drivers going to be happy about the length of their commute increasing while regular car drivers (due to human recklessness) wiz by in the left lane at 130 km/h? I think you'd see a lot of human drivers get frustrated and turn off the AI.
Actually, I'd predict the opposite -- that people will purposefully start to increase their commute times and tell the car to "take the scenic route." People are frustrated with commuting because they have to be mentally engaged doing it. When that's no longer a requirement, people will watch movies/tv, read books / news articles, do their makeup/prep their hair, give each other massages/have sex, play video games, e…
Do people really want to lose their remaining time with their family just to spend it commuting and doing the same stuff they could be at doing at home in the car? How about losing their sleep in the morning because their car takes longer to get them to work than it used to?
Some people might want to roll straight out of bed and into their offices/workplace. A lot of others would rather minimise the time spent going to/leaving work and spend it in their own home doing stuff they want to be doing.