VTI has, on behalf of the City of Gothenburg, Traffic & Public Transport Authority, further highlighted the effects of implemented traffic safety measures, in particular with regards to the socio-economic effects of speed reduction measures taken within the urban area of the City of Gothenburg, 1990 — 2003. The calculations are based on The City of Gothenburg document “Traffic accident development in Gothenburg, 1990 —2003” by Lennart Adolfsson, 24 September 2004. Measures taken include speed bumps and similar speed reduction measures such as hour glass shaped indents on the road by public transport stops, and roundabouts. VTI was commissioned to review the document with focus on the reasonability of the expected reduction of fatalities and serious injuries, and the subsequent monetary evaluation of the above mentioned speed limiting measures. Mr Adolfsson wrote that measures taken have been extremely profitable. “The socio-economic saving for each SEK invested is estimated to equal approximately 40 SEK”. A financial ratio representing the socio-economic effect better is the Net Present Value Ratio (NPVR), as it takes taxes and charges into account. “Estimates made by VTI also takes running costs as well as estimated increased travel time into account, which gives NPVR=21.7”. This is a very high value, but it does not however, reflect the vision presented in 2004. (Author/publisher)
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