The problem with a score out of 100 is that when the scores first are used, a very lwo total has to be used because advancements in the tech mean that the score will only go in one direction. It would mean that vehicles would initially all have very low scores, which would likely put off customers.
The problem with going the other way, as was the case for eco ratings for energy usage is that, like with educational grade inflation, you quickly get way too many getting 'A' and thus you get the ridicuolous state of affairs of A++ etc, etc.
It's even worse now with the NCAP scores because older cars keep the score/rating they were originally given, but obviously there were done using older tech to a lower weighted score.
The only way around this, as far as I can see is for the current rating to get a score out of 100 overall, and when the authorities change the testing to account for new tech, they need to add in and update (each time one is changed) the old scores by adding a new 'weighted muliplier', e.g. (hypothetical)
Original score in 2005 of 80 / 100
Latest test is 4 generations hence, so the scores from the 2005 is weighted by a factor of 0.6, thus the 'comparable' score is 48 / 100.
Probably not perfect either, especially as some safety advancements have made far more of an impact (especially in the early years) on death and serious injury rates (all other things being equal) than others.
The problem as I see it is that firstly the politicians and quango chiefs want to be seen to be 'improving safety' year-on-year so it's in their interests, PR-wise (really only with the media, twitterati and actvisist, not with most of the public), to keep saying yes to ever higher safety standards even if that means cars at the cheaper end of the market become uneconomic.
Much the same can be said for 'environmental' measures, both of which give a reducing balance of improvements and often paper over the negative effects. Cars like the Dacia with low or no star ratings on NCAP tests are likely safer than my 2005-built Mazda3, which 'has' a 4 star rating, but from a far older (and thus less strngent) test standard.
In my view, higher NCAP ratings (and thus safety features) also encourage more people to be (more) reckless in their driving because they believe the car will 'get them out of trouble'. Unfortunately that won't still be the case in many circumstances, and none of them will keep you alive if you are hit with any force by an HGV or are doing over a ton on the motorway and come acropper.
In my view, it is ridiculous that such new cars cannot be judged fairly. Driving safety is as much about the skill and judgement of the driver (including of the road and weather conditions) as it is about the crash resistance and safety features fitted to the car.
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