Ignoring the fact that airbags typically deploy at speeds up to 200 miles an hour and are made of a flexible material that might make them very difficult to put into a Jbeam structure, there is this quote, straight from Nadeox01 in a nearly-identical previous thread from earlier this year:
hmm actualy i would like to plow down a whole shopping mall with people with a semi truck actualy no dont take any of this out of context instead of humans try dummies