instance of motor road vehicle

That was incorrect.  An instance of motor road vehicle is something like the Peekskill Meteorite Car (Q7756463) [2]. 

It is generally incorrect when an item has instance of and subclass of claims with the same value.  I am not aware of a Wikidata constraint template which can encode that rule.  (Off hand I'm not sure how it would be encoded in OWL, either.  Ontology experts: how would we do that?)

If we wanted use both instance of and subclass of in automobile, then we would need to do something like:

    subclass of motor road vehicle
    instance of motor road vehicle class

In my opinion, instance of claims like that are not very useful, because they simply restate what is directly implied in the subclass of claim.  Punning that is not a mere rephrasing can be useful, e.g. Chevrolet Malibu (Q287723) [3] "subclass of mid-size car, instance of car model".

See also Markus's comment from September about using subclass of and instance of in the same item, which conveniently also discusses automobiles [4].

Happy Q11269!

Eric
https://www.wikidata.org/wiki/User:Emw