Keywords: Highway construction workers using concrete saws (9245787233).jpg Highway construction workers using concrete saws https //www flickr com/photos/niosh/9245787233/ Highway construction workers using concrete saws 2013-07-09 09 32 https //www flickr com/people/25069384 N03 National Institute for Occupational Safety and Health NIOSH from USA PD-USGov NIOSH http //flickr com/photos/25069384 N03/9245787233 2015-04-23 18 51 10 United States Government Work Construction Safety Work Workplace National Institute for Occupational Safety and Health |