(iii) That there doesn't seem to be a continuous path between where it is headed immediately and where it will have to go 2 or 3 seconds later. If your immediate future can't be harmonized with what will happen afterward, something is wrong.

(iv) That it has (literally) been down this road before and had to revise its estimate of what it thought it was a lane (i.e. jerk back into the lane once it realized).

(v) That other Teslas have been down this road and learned that.

(vi) That the lane is suddenly getting wider than a freeway lane should, and that doesn't normally happen.

(vii) That the paint is worn, which indicates poor road maintenance, which necessitates caution.

(ix) That it saw a freeway exit sign a short while back, which logically indicates there must be a V-shaped spot ahead somewhere that it shouldn't drive into, and this could be it.