Construction workers work long hours in some pretty rough exterior conditions a lot of the time and there’s no doubt that fatigue is a major factor in job site accidents.  In recent years, we’ve seen a few technological advances that will either reduce worker fatigue or sense it, including robotic attachments, lighter and less vibratory power tools, and camera systems on CAT machines that sense when drivers are closing their eyes too much. Recently, a company out of Australia has been developing a smart hard hat that sensors when mental fatigue has set in.