Safety is relative, will a plastic car, that is comparable to an Auto in size, survive even a small bump from even an Auto. As a matter of fact a lot of ppl who will buy a Nano will be "First Time Drivers", and they will surely contribute to the accidents more than other factors. About Safety, I think a Alto will be surely safer than a Nano, in any accident, as its has a lot more metal, and the rigidity of metal is surely more than that of plastic, according of Physics, if you are familiar with it and automobiles. Also If you remember the accident stats when Maruti 800 was launched, with Nano being more in the reach of common ppl, think what the stats will be.
