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Assessing Segment- and Corridor-Based Travel-Time Reliability on Urban Freeways
| 题名： | Assessing Segment- and Corridor-Based Travel-Time Reliability on Urban Freeways |
| 作者： | Dong, J.; Lu, C.; Liu, C.; Hawkins, N. |
| 关键词： | Travel time reliability##Urban freeways##Highway corridors##Performance measure##Traffic operations##Segment method##VISSIM simulation model## |
| 摘要： | Travel time and its reliability are intuitive performance measures for freeway traffic operations. The objective of this project was to quantify segment-based and corridor-based travel time reliability measures on urban freeways. To achieve this objective, a travel-time estimation model and a travel-time reliability prediction framework were developed. The proposed travel-time estimation model considers spatially correlated traffic conditions. Segment-level and corridor-level travel-time distributions were estimated using travel time estimates and compared with estimates based on probe vehicle data. Corridor-level travel-time reliability measures were extracted from travel-time distributions. The proposed travel-time estimation model can well capture the temporal pattern of travel time and its distribution. For the corridor-level travel-time reliability prediction framework, travel time observations are classified based on weather conditions, segment travel-time distributions are estimated, and segment travel-time distributions are synthesized to corridor travel-time distributions. The segment travel-time distribution estimation model was found to capture the pattern of actual travel-time distributions and could adequately represent the short-term corridor-level travel-time distributions. The proposed travel-time reliability prediction framework provides a systematic way to estimate real-time and near-future corridor travel-time reliability by considering weather impact. A Vissim simulation calibrated to Iowa compared travel-time distribution based on simulated data to that based on probe vehicle data. The simulated travel-time distribution is similar to the travel-time distribution based on probe data. |
| 总页数： | 87 |
| 报告类型： | 科技报告 |
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