For every construction accident, safety experts say, as many as 100 near- misses occur. A quick response this year at the Blue Cross-Blue Shield building in Chicago is an example of one such accident averted. On Jan 21, 2009, crews were building a $270-million vertical “extension,” adding 24 floors onto the existing, occupied 33-story building. An operator was swinging a Potain MR605B luffing jib to make a pick when workers heard a loud “pop”...more.