There has always been the tragic results of racing and there will continue to be no matter what is done. That being said, i feel the main problem today is the lighter "throw away" chassis being built by manufactures. There is a big difference in tubing of 120 gauge verses the .095 gauge now used by the top builders in the US. Just a couple years ago a chassis from outside the US was highly talked down, as unsafe, because of the poor material and light weight. But then it seems the lighter weight took over and has progressed to the problem we seem to have today. I don't have my USAC rule book and can't look up the required gauge rule they have but i would bet that many chassis are below that requirment. Don't have any idea how this could be controlled , short of cuting a cage, and that can't be done, but clearly this needs to be looked into more often. I think a manufacture has a responsibility to build and sign off that ,at least the cage, is built with 120 gauge material for safety FIRST.