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Accession Number PB2014-106467
Title Speed and Road Safety - New Models.
Publication Date Jan 2014
Media Count 50p
Personal Author R. Elvik
Abstract Speed is of major importance for road safety. It is therefore very useful to develop mathematical models of the relationship between speed and road safety. One of the best known of these models, the Power Model, has been used for a long time. Recently, however, an exponential model has also been developed for describing the relationship between speed and road safety. Both these models have been found to fit the data very well and both of them are sufficiently precise to be used for estimating the road safety effects of changes in the speed of traffic. The current report also reviews studies of the relationship between speed variance and road safety. These studies indicate that increased speed variance is associated with an increased risk of accidents. Speed has major importance for road safety. This knowledge was established many years ago. This report updates knowledge about the relationship between speed and road safety. The report covers two characteristics of speed: the mean speed of traffic and speed variance. The relationship between changes in the mean speed of traffic and changes in road safety has been studied in at least 120 studies containing in total at least 550 estimates of the relationship. The relationship between the speed of traffic and road safety has for a long time been modelled by means of the so called Power Model. Recently, however, an exponential model has also been proposed to describe the relationship between the mean speed of traffic and road safety. Both these models are based on extensive data.
Keywords Accident risk
Fatalities
Foreign technology
Injuries
Meta analysis
Motor vehicle accidents
Power Model
Regression analsysis
Roads
Rural roads
Speed limit
Traffic safety
Travel time
Updates
Urban areas


 
Source Agency Foreign Technology-Institute of Transport Economics, Oslo
NTIS Subject Category 85H - Road Transportation
85D - Transportation Safety
91B - Transportation & Traffic Planning
43G - Transportation
Corporate Author Transportoekonomisk Inst., Oslo (Norway).
Document Type Technical report
Title Note N/A
NTIS Issue Number 1419
Contract Number N/A

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