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Guidance for Evaluating the Safety Impacts of Intersection Sight Distance. National Cooperative Highway Research Program (NCHRP) Research Report 875
| 题名： | Guidance for Evaluating the Safety Impacts of Intersection Sight Distance. National Cooperative Highway Research Program (NCHRP) Research Report 875 |
| 作者： | Eccles, K.; Himes, S.; Peach, K.; Gross, F.; Porter, R. J.; Gates, T. J.; Monsere, C. M. |
| 关键词： | Transportation system##Highways##Human factor##Performance##Transportation system planning##Design##Safety##Guidance##National Cooperative Highway Research Program (NCHRP)##Enterprise Information Portals (EIPs)##Intersection##Decision-making process## |
| 摘要： | The provision of appropriate intersection sight distance (ISD) is an important element in intersection design. The approach to the determination of ISD in AASHTO’s A Policy of Geometric Design of Highways and Streets (known as the “Green Book”) is based on gap-acceptance developed in the 1996 NCHRP Report 383: Intersection Sight Distance. This approach includes the ability to more easily calculate ISD for both passenger cars and trucks by allowing the selection of an ISD “design vehicle.” Calculations of ISD using this approach yield different results than those calculated with earlier methods. However, past research efforts to analyze and quantify the safety impacts of ISD have produced inconsistent results, making it difficult to fully evaluate the different approaches. The quantification of these safety impacts would allow better design evaluations that include variations in available ISD. It would also provide the opportunity to evaluate the potential safety impacts of the ISD criteria in the Green Book. Transportation agencies would benefit from guidance on incorporating the safety impacts of intersection sight distance into the decision-making process. OBJECTIVE The objective of this research is to determine the relationships between safety and available ISD and to develop guidelines for transportation agency decision making. The guidelines should be applicable to unsignalized intersections (no control, yield control, and stop control on the minor road). It is expected that the research and guidelines will address the following elements: 1. Identification of appropriate definitions and methods to measure ISD; 2. Quantification of the relationship between safety and available ISD (i.e., Crash Modification Factors and other appropriate functions); 3. Guidance to transportation agencies on how to apply these functions to evaluate the safety impacts of available sight distance |
| 总页数： | 45 |
| 报告类型： | 科技报告 |
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