Abstract
One third of total number of road accidents on motorways in Croatia, resulting in fatalities or seriously injured, are related to run-off accidents and a vehicle hitting an object off the road ones. This is a big issue and represents a significant economic cost, especially since there are measures that can reduce the number of such accidents. International research shows that the implementation of shoulder rumble strips on the edge of the road can reduce the number of such accidents due to drivers being warned about crossing the edge line with a sound effect at an early stage. Moreover, shoulder rumble strips can also serve as an effective lane-finding tool during adverse weather conditions. In this research, a justification analysis of shoulder rumble strips implementation on a motorway in Croatia was conducted. The analysis is based on the database of the Ministry of the Interior on road accidents for the period from 2014 to 2018. Accordingly, implementation sections priorities were selected. To justify the implementation, a simplified CBA was carried out. It showed evident economic profitability of the shoulder rumble strips implementation on the motorway due to potential significant road accidents reduction. Therefore, the social benefit from reducing the number of road accidents is estimated between 7.8 to 15.7 million euros annually.
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