What parts of "pull over" related to an autonomous semi driving on a freeway looking for a spot that's not sheer, a bridge, unstable rock, mountainous, long eno

What parts of "pull over" related to an autonomous semi driving on a freeway looking for a spot that's not sheer, a bridge, unstable rock, mountainous, long enough and doesn't leave the ass in the freeway, not blocking an exit, etc.. is not harder than actual rocket science?