Abstract: Significant amount of safety hazards are accumulated on the highway slopes after years of opening to the traffic and these hazards impose a potential threat to the safety of highway operation. The paper presents the case study of the instability concerns of the live trafficked highway segment between K36+220 and K36+480 in Zhejiang Province. The regional factors, such as, topography, subsurface lithology, tectonic structures, seismic conditions, meteorology and hydrology conditions, are investigated. The characteristics of the highway slopes and their associated hazards are presented. Both qualitative and quantitative evaluations of these highway slopes are performed and mitigation recommendations are proposed.

Key words: Live Trafficked Highway, Highway Slopes, Hazard Evaluations, Slope Stability, Mitigation Alternates