Or put in other words, the new Smart Fortwo got a 4-star rating for occupant safety in the EuroNCAP crash test the same as, for example, an Audi Q7. The two cars are not directly comparable, of course, and the EuroNCAP always highlights that cars from different classes are not directly comparable. However, another key difference is that in the Smart class of vehicles 4-star is a very good rating since neither the 107/C1/Aygo or the Renault Twingo have 5-star results. The same can not be said about the class of cars where the Q7 competes... unless the Q7 is in a class of its own... a 4-star class of car.
Another interesting bit is that we can safely guess that the Smart will not get a 5-star rating in the future... but then we predicted long ago that Audi would improve the Q7 to get a 5-star rating but since then that prediction failed to materialize. And we hate to fail our future predictions.