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Originally Posted by geckoGT
The calculation of the 5 star rating is made on passenger injury patterns and passenger cell deformation. If a small car has achieved a 5 star rating and a large car has achieved a 5 star rating, they both demonstrated similar injury patterns and passenger cell deformation when equivalent forces are applied. There is no difference between small car and large car 5 star ratings.
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Hitting an immovable object is the equivalent of hitting a car with the same mass at the same speed from the opposite direction, how many cars on the road are the same mass as a 1000kg Fiesta?
The point I was making is that a Fiesta gets the 5 star rating in a test which is the equivalent of hitting another Fiesta head on (ie same mass), the Fiesta isnt tested against hitting an object of greater mass (ie against a Falcon or a Landcruiser) - This has been demonstrated is numerous tests including a 4 star Audi SUV (greater mass) hitting a 5 star Smart car (smaller mass), the results were minor injuries to the Audi driver with life-threatening injuries to the Smart driver. The Smart gets its 5 star rating hitting the equivalent of another Smart at the same speed, not against hitting the average vehicle on the road.
The Ancap tests are good for comparing cars which are hitting trees or solid walls, they are not good seeing what the results would be hitting other cars where differences in mass come into play.