Flying Lawyer:
Believe it or not, my previous post was intended to be serious, but I'm not sure that the same applies to your response - a case of "lingua in bucca" perhaps? Both traffic and pedestrians are controlled and constrained in order to prevent accidents for which the likelihood is defined by normal statistical means. My point about banner flying over built-up areas was that it should be subject to the same controls and that the referenced accident - if indeed it was thus and not a hoax - might be relevant to the statistical analysis involved therein. I'm sorry if this was not clear.