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Stability and Accuracy of HCM Level of Service in Darkness and Adverse Weather. Final rept.
| 题名： | Stability and Accuracy of HCM Level of Service in Darkness and Adverse Weather. Final rept. |
| 作者： | Chien-S.I.; Daniel-J.R.; Bladikas-A.K. |
| 关键词： | *Highway-capacity.;Speed-; Traffic-flow; Travel-time; Reliability-; Stability-; Accuracy-; Weather-; Darkness-; New-Jersey; Urban-areas; Highway-arterials. |
| 摘要： | The Highway Capacity Manual (HCM) uses average travel speed to assign Levels Of Service (LOS) to urban streets and arterials. However, the HCM procedure for estimating travel speeds has weaknesses, particularly in the determination of the Free-Flow Speed (FFS), by failing to account for the impact of weather conditions (e.g., rain, snow, ice, etc,) and light conditions (e.g., sunglare, darkness, etc.). In this research, traffic data, under adverse weather, were collected and the impact of weather conditions to speed and density on selected New Jersey highways were investigated. Equations were developed to adjust the capacity estimation formula and figures suggested by HCM (2000) that can be used to accurately estimate travel times for buses and general traffic considering darkness and adverse weather. |
| 报告类型： | 科技报告 |
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