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Methods for Identifying High Collision Concentrations for Identifying Potential Safety Improvements: Development of Safety Performance Functions for California.
| 题名： | Methods for Identifying High Collision Concentrations for Identifying Potential Safety Improvements: Development of Safety Performance Functions for California. |
| 作者： | Shankar, V.; Madanat, S. |
| 关键词： | Traffic safety, Collisions, California, Safety performance, Model transferability, Roadway segments, Intersections, Ramps, Statistical models, Geometrics, Traffic control, Safety Performance Functions (SPFs), Average Daily Traffic (ADT) |
| 摘要： | This research developed type 1 and type 2 safety performance functions (SPFs) for roadway segments, intersections and ramps on the entire Caltrans network. Type 1 SPFs involved statistical models with a length offset, and average daily traffic (ADT) while type 2 SPFs included geometrics as well. In the case of intersections, type 2 SPFs included traffic control, ADT and roadway geometrics. For ramps, type 2 SPFs included variables related to metering, HOV lane presence and ramp configuration. The research developed SPFs using data based on the period 2005-2010, and tested the SPFs on the period 2011-2012. Type 1 and type 2 SPFs were compared for predictive effectiveness, and it was found that type 2 SPFs provided for better measures of effectiveness such as mean absolute deviation, mean absolute percent error and mean squared error. |
| 总页数： | Shankar, V.; Madanat, S. |
| 报告类型： | 科技报告 |
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