For trucks on highways you might not need continuous attention. For example I've driven between Los Angeles and the Bay Area late at night, and between central

For trucks on highways you might not need continuous attention. For example I've driven between Los Angeles and the Bay Area late at night, and between central California and Seattle late at night, and for much of that time there were no other cars near me. Just the occasional faster car that comes from over the horizon behind me, passes me, and disappears over the forward horizon, or the occasional situation where I'm the faster car doing that to someone else. With an AI driver I could have read or slept most of the trip with the AI only asking me to pay attention when we are encountering other vehicles or there is anything unexpected near the road, and probably covered 99% of the cases where something happens that needs an attentive human driver to take over for.