Task Order 6215
Transportation Safety Research
Methods for Identifying High Collision Concentration Locations for Potential Safety Improvements
In 1999, Caltrans formed a task force to review its process (Table C) for "high collision concentration location" (HCCL) identification. The Task Force C published a set of recommendations aiming to improve the current Table C process. In response to these recommendations, this project calls for work to establish a systematic methodology that increases the efficiency of the task of identifying HCCL. To explore improvements to the current Table C process, the research team will consider:
The goal of the project is to generate the algorithms and guidelines required for efficient identification of HCCL compatible with Table C methodology. Public safety is the first priority for Caltrans, and this project will develop tools for Caltrans to improve highway safety and to reduce injuries and fatalities caused by crashes.
- developing statistical models for generating expected collision risk based on observed frequency at a given location;
- utilizing available information about collisions and locations (e.g., highway characteristics) to generate the predicted risk;
- weighting collision outcomes by severity;
- considering variable segment lengths for highway analysis;
- considering extended roadway segments ("corridors with promise"), and
- screening for deterioration of safety over time.