If it can't cope with things like pedestrians and roadkill
What the hell is it doing on public roads?
I understand, highway driving is- for the most part- simple. Especially for trucks. Maintain a constant speed in the left-hand lane (or right-hand lane for some odd bits of the world). Don't leave your lane, slow down if you're going to hit anything.
But in those circumstances a human's pretty safe too. It's only (mainly) when they've been lulled into a false sense of security and then things change that there are problems. So designing in this false sense of security seems to me to be a mistake. It HAS to be able to cope with a deer crossing the road, or an unexpected icy / oily patch or a tyre blowing out. If it can't cope with any eventuality you could reasonably throw at it, it shouldn't be allowed on any roads without the course being closed to public traffic.