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- W1564376247 abstract "The intention of this study, which was made at the request of the Swedish National Road Administration (VV), was to evaluate the effects of countermeasures taken at 217 junctions during the years 1978-1981 as part of the regional road authorities' traffic safety program (VF-TSA). The sites studied have divided up according to 10 different classes of countermeasures, including traffic signals, roundabouts, left-turn lanes with kerbstones or road markings, secondary road islands and sight improvement. Data on accidents registered by the police during 1973-1983 have been used. Since these refer to a non-experimental before-and-after study, several difficulties arise. The greatest problem is to determine which proportion of the total reduction in accidents that can be attributed to the countermeasures taken and which proportion that is due to the regression-to-the-mean. The overall effect of the countermeasures on the number of accidents has been estimated to be 20% on average. This is after correction has been made for the reduction in number of accidents due to randomness, i.e., the regression-to-the-mean of countermeasures of about 20%. For a total cost about 100 accidents, each costing about SEK 225,000, has been achieved during a total of 712 years, i.e., an average of 3.3 years per junction, after introducing such countermeasures. This corresponds to a first year's yield of about 25%." @default.
- W1564376247 created "2016-06-24" @default.
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- W1564376247 date "1985-01-01" @default.
- W1564376247 modified "2023-09-27" @default.
- W1564376247 title "COUNTERMEASURES TAKEN AT JUNCTIONS AS PART OF THE REGIONAL ROAD AUTHORITIES' TRAFFIC SAFETY PROGRAM. EFFECTS DUE TO THE REGRESSION-TO-THE-MEAN AND TO THE COUNTERMEASURES RESPECTIVELY" @default.
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