Hazard and Risk of Highway Maintenance Works: Case Study of PLUS Expressways Asmalia Che Ahmad, Ida Nianti Mohd Zin, Mohamad Nasrin Rosli, Abdul Muhaimin Ab Wahid and Izatul Farrita Mohd Kamar MATEC Web Conf., 66 (2016) 00106 Published online: 13 July 2016 DOI: 10.1051/matecconf/20166600106