题名: |
SPEED PREDICTION FOR TWO-LANE RURAL HIGHWAYS. |
作者: |
Fitzpatrick-K; Elefteriadou-L; Harwood-DW; Collins-JM; McFadden-J; Anderson-IB; Krammes-RA; Irizarry-N; Parma-KD; Bauer-KM; Pasetti-K |
关键词: |
Curves-Geometry; Design-; Design-consistency; Driver-expectations; Drivers-; Driving-; Equations-; Forecasting-; Geometry-; Rural-highways; Speed-; Two-lane-highways |
摘要: |
Design consistency refers to the conformance of a highway's geometry to driver expectancy. Drivers make fewer errors in the vicinity of geometric features that conform to their expectations. A technique to evaluate the consistency of a design is to evaluate changes in operating speeds along an alignment. To use 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 TWOPAS model; and prior to or after a horizontal curve. The findings from the different efforts were incorporated into a speed-profile model. The model can be used to evaluate the design consistency of the roadway or can be used to develop a speed profile for an alignment. The model considers both horizontal and vertical curvature and the acceleration or deceleration behavior as a vehicle moves from one feature to another. |
总页数: |
2000/08. 9509-9906 pp217 (74 Fig., 68 Tab., Refs.) |
报告类型: |
科技报告 |