Title Capacities and Traffic Characteristics of Rural Expressways in Taiwan (I)
Dept IOT
Year 2003
Month
Price
Summary Published in April 2003
IOT SERIAL No. 92-33-1202，170pp.


Chapter 11 of 2001 Taiwan Area Highway Capacity Manual describes a methodology for analyzing the levels of service of suburban and rural multilane highways. This methodology does not consider signalized intersections, and it relies heavily on outdated method and traffic information provided by the U.S. 1985 Highway Capacity Manual. As a consequence, Taiwan does not have a suitable methodology for analyzing multilane highways. To address this problem, this project is intended to achieve the following objectives: (1) To collect and analyze field data to promote a better understanding of the traffic flow characteristics of multilane highways
and (2) To develop a preliminary methodology for analyzing multilane highways. The scope of this project is limited to the investigation of multilane highways that, in each direction, have two express lanes primarily for cars and heavy vehicles and another lane to accommodate motorcycles. The tasks carried out include: (1) reviewing literature
(2) developing a method for estimating average free-flow speed
(3) establishing criteria for classifying highway facilities into two types sections based on the presence or absence of the influence of signalized intersections
(4) collecting and analyzing data to reveal speed-flow relationships
(5) developing a preliminary methodology for analysis of multilane highway sections that are not affected by signalized intersections
(6) identifying future research needs
and (7) preparing research reports. The field data collection effort of this project is focused on the free-flow speed characteristics and the speed-flow relationships of the traffic on facilities with a 70- km/h speed limit. Because of a lack of suitable sites for investigating the flow-speed relationships in sections not subject to the influence of signalized intersections, speed-flow data are collected from sites near urban centers where flow rates vary over wide ranges but the spacing between two adjacent signalized intersections is not long. These data are used to test and modify a simulation model. Simulation data in conjunction with observed free-flow speed characteristics are then used to develop a preliminary methodology for analysis of sections not affected by signalized intersections.
Post date 2004/12/29
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