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RELIABILITY APPROACH TO INTERSECTION SIGHT DISTANCE DESIGN.
| 题名： | RELIABILITY APPROACH TO INTERSECTION SIGHT DISTANCE DESIGN. |
| 作者： | Easa-SM |
| 关键词： | Design-; Intersections-; Reliability-method; Sight-distance |
| 摘要： | The intersection sight distance (ISD) design presented by AASHTO is based on extreme values of the component design variables such as design speed, perception-reaction time (a high percentile), and friction coefficient (a low percentile). A reliability method is presented, based on AASHTO, that does not rely on extreme values but instead considers the moments (mean and variance) of the probability distribution of each random variable. The method also accounts for correlations among the component random variables. In Cases I and II of AASHTO, the variations of the sight distance along both legs of the intersection are considered for both design and evaluation. For evaluation (involving an exiting obstruction), these variations are combined into a single variable that determines whether the corresponding sight line is obstructed. In Case III, only the sight distance leg along the major road has variations. The proposed method is straightforward and involves simple, closed-form mathematics for calculating sight distance and associated reliability. Sensitivity of ISD to various design variables is examined. ISD reliability-based values for various cases are presented from data reported in the literature, and results are compared with current AASHTO design values. |
| 总页数： | Transportation Research Record. 2000. (1701) pp42-52 (5 Fig., 6 Tab., 27 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- Guidance for Evaluating the Safety Impacts of Intersection Sight Distance. National Cooperative Highway Research Program (NCHRP) Research Report 875
- Evaluation and Modification of Sight Distance Criteria Used by TxDOT. Research Report; Rept. for Sep 97-Aug 98
- Evaluation and Modification of Sight Distance Criteria Used by TxDOT. Project Summary Report; Rept. for Sep 97-Aug 98
- METHODOLOGY TO CALCULATE SIGHT DISTANCE AVAILABLE TO DRIVERS AT SKEWED INTERSECTIONS.
- SIGHT DISTANCE FOR STOP-CONTROLLED INTERSECTIONS BASED ON GAP ACCEPTANCE.
- INTERNATIONAL SIGHT DISTANCE DESIGN PRACTICES.
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