The other problem with such a tiny car is that, if hit with sufficient force, it is likely to travel much further–possibly airborne–from the point of impact before it comes to rest. If that travel path puts it in front of…let’s say…an 18-wheeler…that safety cell will be crushed, along with the people inside.
As an example of what I am talking about, several years ago, I was a passenger in my friend’s 2003 Accord sedan–a decently mid-sized car. While we were attempting to exit from a gas station, some crazed woman in a Lexus SUV careened off the highway, barreled onto the gas station property, and hit us more or less broadside.
Even though we were about 10 feet from the roadway at the time of impact, our car spun around and wound up partially in the right lane of US-1. I am convinced that, if we had been in a so-called Smart car, instead of spinning around and being pushed about 15 feet, we would have become airborne and wound up much further away–very possibly in the left lane of the roadway, or even over the divider into the opposing lanes.