A Study of Traffic Flow Models on Freeway Work Zones

• Main Authors: Ting-Yu Chang, 張庭瑜
• Other Authors: Juen-Hai Fan
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/48398563564061079929

碩士 === 淡江大學 === 運輸管理學系 === 88 === The purpose of this study is to compare traditional high-order traffic flow models applied on freeway work zones and build a modified methodology. A good traffic flow model is contributive to control traffic states, especially in the work zones. When the lane dropped, a proper control could not only minimize the total delay, but also diminish the effectiveness of work zones. For this reason, this study focusing on freeway work zones used high-order continuum models of Payne and Michalopoulos as base and furthered to consider the characteristic of work zones including the geometry condition and the drivers’ choice behavior. According to the investigated data that was using for calibrating the models we found the more the distance the drivers approached to the work zone, the more the speed decreased. Then, we used the two-stage method to identify the parameters. The First stage was to calibrate the basic characters of the traffic flow parameters and the second stage was to search the better parameter sets by minimizing the differences between the real data and model outputs. Finally, we compared the modified models before and after using the results of statistic validation, it suggested that the modified models were more accurate.