Swiss-wide, standardized information on natural hazards that threaten national roads (highways) are not available. The Swiss federal roads office (FEDRO) therefore decided to initiate a four year project, aiming at quantifying and mapping all risks due to natural hazards threatening Swiss national roads. Snow and rock avalanches, rock- and ice-fall, flooding, collapse dolines and different types of landslides are accounted for. Landslides include permanent slides, spontaneous slides and shallow debris slides. For all these landslide types the frequency and intensity should be determined by geotechnical bureaus that carry out the field investigations and the subsequent hazard and risk analysis. To aim for a homogeneous and comparable dataset, a methodology for the hazard and risk analysis has been developed.This paper presents the developed method and illustrates how it can be used for calculating the landslide risk on a highway 

by means of an example case.