Supposing we restricted AI self-driving cars to operating on public roads only late at night to sunrise
Driving a car when it is very late at night or abundantly early in the morning can be refreshing, plus a bit eerie too.
The roads are usually relatively empty of traffic. Sure, there are those occasional instances where a cluster of cars get bunched up together, but this is not a particularly frequent occurrence and furthermore, the momentary snarls are quickly sorted out. You can usually drive along and not worry about being stuck behind that annoying driver that is going as slow as a tortoise. All you need to do is scoot around them. The traffic signals are typically green for any main roadways and you are able to proceed without those ill-timed red lights that during the day cause the traffic to become hindered.