we currently test diesel engines to the manufacturer speecified smoke limit unless not available in which case we test to a(generally much more lenient)default limit.this limit is in different places of variable visibility or is indeed not displayed at all.we have yet to even be given instructions on where its likely to be on a given vehicle(because none of us is an expert on EVERY vehicle out there)so you would think we would be given this info via the mot system from the guys who type approved it in the first place but despite repeated requests for same nothing.all a vehicle owner has to do is destroy/deface this limit and it gets tested to default.this has gone on for about 3 yrs now,please take the time to read thru matters of testing blog where your concerns and many others have been raised by us as a trade and utterly ignored(pleas keep in mind that the posts you will be reading were the ones that WERENT moderated).given we now have a 3 yr delay on basic important stuff like people being able to breathe(including us!)what do you think the hopes of us getting db info are?2-3 yrs at best to implement,2-3 yrs to have any realistic effect at which point the cars concerned will be fading from the roads anyway.sorry to keep pissing on your bonfire but near 40 yrs of being baked on the free range oven that is the dept of transport leads me to believe your entire concept will be kicked into the long grass if anyone ever pays anymore than lip service to it in the first place.i hope as ver to be proved wrong but dont get your hopes up on that,its a pretty rare occurence.
