The Letters section on page four of ENR's June 4, 2012, edition, in which William Shuzman of the Allied Building Metal Industries commented on an earlier staff editorial regarding crane safety in New York City, gives some numbers that are not correct. The misinformation is why construction safety is not improving.
First, one could infer from the 75% and 85% levels that were stated in the letter for a crane's reduced load chart that these numbers are safety factors when they are not.
Because it can moderate the damaging effects of earthquakes, base-isolation is a technique used primarily in seismically active regions. ENR takes a look at some of the largest applications of base-isolation technologies in the world.