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EVALUATION OF DESIGN CONSISTENCY METHODS FOR TWO-LANE RURAL HIGHWAYS, EXECUTIVE SUMMARY.
| 题名： | EVALUATION OF DESIGN CONSISTENCY METHODS FOR TWO-LANE RURAL HIGHWAYS, EXECUTIVE SUMMARY. |
| 作者： | Fitzpatrick-K; Anderson-IB; Bauer-KM; Collins-JM; Elefteriadou-L; Green-P; Harwood-DW; Irizarry-N; Koppa-R; Krammes-RA; McFadden-J; Parma-KD; Passetti-K; Poggioli-B; Tsimhoni-O |
| 关键词： | Alignment-; Consistency-; Drivers-; Forecasting-; Geometric-segments; Geometry-; Highway-curves; Highway-design; Highway-grades; Research-; Rural-highways; Speed-; Speed-distribution; Tangents-; Two-lane-highways; Visual-demand; Workload- |
| 摘要： | Design consistency refers to the conformance of a highway's geometry with driver expectancy. Techniques to evaluate the consistency of a design documented within this report include speed-profile model, alignment indices, speed distribution measures, and driver workload. The use of operating speed as a consistency tool requires the ability to accurately predict speeds as a function of the roadway geometry. In this research project, several efforts were undertaken to predict operating speed for different conditions such as on horizontal, vertical, and combined curves; on tangent sections using alignment indices; on grades using the TWOPAS model; and prior to or after a horizontal curve. The findings from the different efforts were incorporated into a speed-profile model. Alignment indices are quantitative measures of the general character of a roadway segment's alignment. These potential indicators may identify a geometric inconsistency when there is a large increase in the magnitude of the alignment indices for a successive roadway segment or feature or when a high rate of change occurs over some roadway length. Speed distribution measures investigated included variance, standard deviation, coefficient of variation, and coefficient of skewness. Driver workload is a measure of the information processing demands imposed by roadway geometry on a driver. |
| 总页数： | 2000/08. 9509-9901 pp29 (9 Fig., 5 Tab., 13 Ref.) |
| 报告类型： | 科技报告 |
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