| Title | The Integrate of Highway Capacity Terminology and Survey Methods in Taiwan Area |
| Dept | Transportation Planning and Land Transport Division |
| Year | 1999 |
| Month | |
| Price | |
| Summary | Highway capacity analysis is the base of highway transportation facilities planning, design,and performance evaluation. And the definitions of capacity terminology and survey methods of traffic characteristics data are important factors affecting capacity analysis. However, the Institute of Transportation Ministry of Transportation and Communications has found that there are different definitions of the same terminology and the survey methods are not identical, either. The purpose of this study is to correct the terminology with vague senses and different definitions and unify survey methods of important traffic parameters in Taiwan area. In the definition of terminology, this study first reviews the Taiwan Highway Capacity Manual, the Highway Capacity Manual of U.S.A, and other references. And then the terminology with vague senses or several different definitions are classified into three categories. By means of the procedures of discussions and analysis, terminology definitions are corrected or made certain more clearly. As for survey methods of traffic parameters, ten important traffic parameters are selected from previous studies of I.O.T., and their surveys and analysis methods are proposed, including free-flow speed, average travel time, critical gap, average stopped delay of approach, saturation flow rate, passenger car equivalent, peak hour factor, K factor, D factor and the 15th percentile pedestrian speed. In order to evaluate the fitness and feasibility of survey and analysis methods of parameters, field data or existing data are used. In addition, this study also describes the use of default values for capacity analysis in Taiwan area. The results of this study have provided the reference and help for the analysis of highway capacity in Taiwan area. |
| Post date | 1999/11/30 |
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