Safety Performance Functions for Low-Volume Roads
This paper analyzes roadway safety conditions using the network approach for a number of Italian roadways within the Province of Salerno. These roadways are characterized by low-volume conditions with a traffic flow of under 1000 vpd and they are situated partly on flat/rolling terrain covering 231....
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| Format: | Article |
| Language: | English |
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Riga Technical University Press
2011-12-01
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| Series: | The Baltic Journal of Road and Bridge Engineering |
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| Online Access: | https://bjrbe-journals.rtu.lv/article/view/3759 |
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| _version_ | 1850089310467915776 |
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| author | Gianluca Dell’Acqua Francesca Russo |
| author_facet | Gianluca Dell’Acqua Francesca Russo |
| author_sort | Gianluca Dell’Acqua |
| collection | DOAJ |
| description | This paper analyzes roadway safety conditions using the network approach for a number of Italian roadways within the Province of Salerno. These roadways are characterized by low-volume conditions with a traffic flow of under 1000 vpd and they are situated partly on flat/rolling terrain covering 231.98 km and partly on mountainous terrain for 751.60 km. Since 2003, the Department of Transportation Engineering at the University of Naples has been conducting a large-scale research program based on crash data collected in Southern Italy. The research study presented here has been used to calibrate crash prediction models (CPMs) per kilometer per year. The coefficients of the CPMs are estimated using a non-linear multi-variable regression analysis utilizing the least – square method. In conclusion, two injurious crash prediction models were performed for two-lane rural roads located on flat/rolling area with a vertical grade of less than 6% and on mountainous terrain with a vertical grade of more than 6%. A residuals analysis was subsequently developed to assess the adjusted coefficient of determination and p-value for each assessable coefficient of the prediction model. CPMs are a useful tool for estimating the expected number of crashes occurring within the roads’ geometric components (intersections and road sections) as a function of infrastructural, environmental, and roadway features. Several procedures exist in the scientific literature to predict the number of crashes per kilometer per year. CPMs can also be used as a tool for safety improvement project prioritization. |
| format | Article |
| id | doaj-art-d89f67eeaccf4ac5b8cb31756518fe40 |
| institution | DOAJ |
| issn | 1822-427X 1822-4288 |
| language | English |
| publishDate | 2011-12-01 |
| publisher | Riga Technical University Press |
| record_format | Article |
| series | The Baltic Journal of Road and Bridge Engineering |
| spelling | doaj-art-d89f67eeaccf4ac5b8cb31756518fe402025-08-20T02:42:48ZengRiga Technical University PressThe Baltic Journal of Road and Bridge Engineering1822-427X1822-42882011-12-016422523410.3846/bjrbe.2011.292089Safety Performance Functions for Low-Volume RoadsGianluca Dell’Acqua0Francesca Russo1Dept of Transportation Engineering “Luigi Tocchetti”, University of Naples “Federico II”, Via Claudio 21, I-80125 Naples, ItalyDept of Transportation Engineering “Luigi Tocchetti”, University of Naples “Federico II”, Via Claudio 21, I-80125 Naples, ItalyThis paper analyzes roadway safety conditions using the network approach for a number of Italian roadways within the Province of Salerno. These roadways are characterized by low-volume conditions with a traffic flow of under 1000 vpd and they are situated partly on flat/rolling terrain covering 231.98 km and partly on mountainous terrain for 751.60 km. Since 2003, the Department of Transportation Engineering at the University of Naples has been conducting a large-scale research program based on crash data collected in Southern Italy. The research study presented here has been used to calibrate crash prediction models (CPMs) per kilometer per year. The coefficients of the CPMs are estimated using a non-linear multi-variable regression analysis utilizing the least – square method. In conclusion, two injurious crash prediction models were performed for two-lane rural roads located on flat/rolling area with a vertical grade of less than 6% and on mountainous terrain with a vertical grade of more than 6%. A residuals analysis was subsequently developed to assess the adjusted coefficient of determination and p-value for each assessable coefficient of the prediction model. CPMs are a useful tool for estimating the expected number of crashes occurring within the roads’ geometric components (intersections and road sections) as a function of infrastructural, environmental, and roadway features. Several procedures exist in the scientific literature to predict the number of crashes per kilometer per year. CPMs can also be used as a tool for safety improvement project prioritization.https://bjrbe-journals.rtu.lv/article/view/3759crashesprediction modelsroad safety analysis |
| spellingShingle | Gianluca Dell’Acqua Francesca Russo Safety Performance Functions for Low-Volume Roads The Baltic Journal of Road and Bridge Engineering crashes prediction models road safety analysis |
| title | Safety Performance Functions for Low-Volume Roads |
| title_full | Safety Performance Functions for Low-Volume Roads |
| title_fullStr | Safety Performance Functions for Low-Volume Roads |
| title_full_unstemmed | Safety Performance Functions for Low-Volume Roads |
| title_short | Safety Performance Functions for Low-Volume Roads |
| title_sort | safety performance functions for low volume roads |
| topic | crashes prediction models road safety analysis |
| url | https://bjrbe-journals.rtu.lv/article/view/3759 |
| work_keys_str_mv | AT gianlucadellacqua safetyperformancefunctionsforlowvolumeroads AT francescarusso safetyperformancefunctionsforlowvolumeroads |