| Title | Development and Applications of a Model for Simulation of Traffic on Highway Grade Segments (2/3) |
| Dept | Transportation Planning and Land Transport Division |
| Year | 2015 |
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| Price | |
| Summary | This project is the second phase of a three-year research effort initiated by the Institute of Transportation (IOT), Ministry of Transportation and Communications. Its objective is to develop a microscopic simulation model to facilitate capacity and level-of-service analysis of rural two-lane highways that have uninterrupted flow. The resulting model is referred to as Traffic-on-Grade Simulation-2Lane Model, or TGS-2L Model in short. The tasks conducted in the project includes a review of flow characteristics and practices in capacity and level-of-service analysis, development of simulation logic, testing and calibration of the model, and preparation of instructions on the applications of the model. Although the TGS-2L model can realistically simulate the traffic flows on several flat highway segments and grade segments, it needs further testing and calibration. In particular, there is a need for a better understanding of the transition of free-flow speed when a vehicle approaches, enters, and then exits a horizontal curve that has a certain combination of radius and slope. Such a speed transition can be expected to affect the capacity of a horizontal curve that is frequently present on rural two-lane highways. In addition to applications in capacity and level-of-service analysis, the TGS-2L Model can be used to help in the design of upgrades, climbing lanes, and turnouts. It is suggested that the levels of service of rural two-lane highways be classified in terms demand flow rate to capacity ratio and the difference between speed limit and average travel speed. Chapter 12 of the 2011 Taiwan Highway Capacity Manual is out-of-date. This chapter may be revised by focusing on the applications of the TGS-2L model. |
| Post date | 2015/08/21 |
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