| Title | Development of Improved Methods for Capacity Analysis of Signalized Urban Intersections (2/2) |
| Dept | Transportation Planning and Land Transport Division |
| Year | 2007 |
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| Summary | Chapter 13 of the 2001 Taiwan Area Highway Capacity Manual provides a procedure for signalized urban intersections analysis. However, the procedure is outdated. Therefore, the Institute of Transportation, Ministry of Transportation and Communications initiated a two-year study in 2005 to revise the chapter. The current project is the second phase of the study and its major tasks include: (1) collect field data on the queue discharge characteristics of various types of traffic lanes (2) collect filed data to assess the impacts of bus stop operation and pedestrian on lane capacity (3) calibrate the Highway Traffic Systems Simulation (HTSS) model version 1 (4) develop models for capacity estimation and (5) prepare a draft of the revised Chapter 13. Six types of traffic movement investigated in this study are: (1) straight through (2) unopposed left turn (3) opposed left turn (4) shared straight through and left turn (5) shared straight through and right turn and (6) motorcycles only. The study sites are located in the cities of Taipei, Taichung, Tainan, Chayi, Sinchu, Taoyuan, and Chunli, respectively. The field data show that queue discharge characteristics vary with lane type and location. But nonlinear regression models can accurately represent the discharge rate characteristics of most types of traffic lanes. The calibrated HTSS model is capable of providing realistic estimates of queue discharge rates. The functionalities of this model, however, need to be enhanced. An assessment of the current procedure reveals that it requires substantial modifications in the way of estimating capacity. The revised chapter has develped an improved procedure incorporating most of the needed modifications. |
| Post date | 2007/11/02 |
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