Keywords: Road work ahead (2492025099).jpg Group of highway workers using jackhammers to remodel a highway https //www flickr com/photos/niosh/2492025099/ Road work ahead 2008-05-14 13 16 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 N03/2492025099 2015-04-28 21 54 45 United States Government Work Construction People using hammers Safety Work National Institute for Occupational Safety and Health Safes |