The report studies the problem of estimating in a non-experimental before-and-after investigation the effect of a countermeasure on the number of traffic accidents at road junctions. The accidents are assumed to occur according to a Poisson process with different intensities at different junctions.
Estimation of the effects of countermeasures on different types of accidents in the presence of regression effects
โ Scribed by Stig Danielsson
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 615 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0001-4575
No coin nor oath required. For personal study only.
โฆ Synopsis
In an earlier paper [Danielsson, 1986], we studied the problem of estimating the safety effect of a countermeasure on the expected number of accidents at road junctions when high-accident sites are selected for the study. Often, however, the countermeasure leads to varying effectiveness on different types of accidents. This paper is a generalization in that we estimate effects of countermeasures for each type of accident. A major result, for which empirical support is provided, is that the expected regression effect is the same for all types of accidents.
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