BY BY - If it is against ADR's or whatever to have something like an A-pillar gauge then how can it be engineered? Doesn't it need to comply by ADR's to allow it to be engineered?
I am not sure how well the "well the cops have it" argument holds.... for example we've seen heaps of cop cars do illegal u-turns, park illegally, speed etc etc but its very difficult to use this in court. In the case of the defective WRX at least there is evidence but I think the best defense against getting a fine is some sort of certification such as engineer certificate (if that can be had for a-pillar gauge).