| Title | Capacity and Service Level Analysis of Exclusive Motorcycle Lanes, Urban Bus Transit Facilities, and Urban Arterials (1/3) |
| Dept | Transportation Planning and Land Transport Division |
| Year | 2008 |
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| Summary | In 2007, the Institute of Transportation initiated a three-year project to revise three chapters of the 2001 Taiwan Area Highway Capacity Manual. This project is divided into three phases. Phase 1 involves the revision of Chapter 18, Motorcycle Lanes, and the collection of field data to identify the flow characteristics of urban arterials. Phase 2 focuses on completing the revision of Chapter 16, Urban Arterial, and the collection of data to reveal some of the operating characteristics of bus transit facilities. Phase 3 continues data collection on bus transit operations and completes the revision of Chapter 17, Urban Transit Facilities. To lay a foundation for the revision of Chapter 12, Rural Two-Lane Highways, all the aforementioned phases also involves collecting field data to identify the flow-speed relationships on rural two-lane highways. This report documents the tasks carried out in Phase 1 and the findings. The tasks include: (1) reviewing literature on the capacity analysis of motorcycle lanes and urban arterials (2) collecting and analyzing field data related to the queue discharge rate, wheel-path distribution at stop line, free-flow speed, and dispersion in motorcycle lanes (3) developing capacity analysis tools and revision of Chapter 18, Motorcycle Lanes (4) collecting data to reveal the ranges of average travel speed as well as the temporal and the spatial variations of traffic flow on urban arterials (5) collecting data on free-flow speed and acceleration behavior of queuing vehicles for calibrating the Highway Traffic Systems Simulation (HTSS) Model. The revision of Chapter 18 is complete. The revised Chapter 18 uses a new parameter, which is referred to as effective lane width, to estimate the saturation flow and the capacity of a motorcycle lane. The calibrated HTSS Model can reliably duplicate the queue discharge behavior in motorcycle lanes. The revised Chapter 18 details the application of this model for analyzing the levels of service of motorcycle lanes. Data collection on the operating characteristics of urban arterial and rural two-lane highway will extend into phase 2, which will begin in early 2008. Existing field data reveals that, average free-flow speed varies from one lane to another according to an easily identifiable pattern that is consistent among arterials of different geometric designs. |
| Post date | 2008/12/15 |
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