What he, and I mean, Is if you think a concept car should no longer be classified as a normal car then where should it be put? there are only three category's in the game .. normal/race/tuner .. we cannot have unclassified cars in the game, it needs to fit somewhere so the only solution would be that which I posted previously, a 'concept' classification which would also encompass all other cars that are not production, race, or tuner cars.
[Also, I was not expressing an idea that I am wanting in the game, I was simply explaining why a 'concept' classification does not already exist, it would be more hassle than it's worth for PD]
I also understand what was suggested originally, that it should be excluded from 'normal car' time trials, just as a singular non-eligible car, but I hardly think that would be fair for the poor little thing.