The Traffic Flow Models of Freeway Bottlenecks

• Main Authors: Chang, Ruey-Ling, 張瑞玲
• Other Authors: Hsun-Jung Cho
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/21036594763576341906

碩士 === 國立交通大學 === 交通運輸研究所 === 85 === Freeways provide exclusively for through movement of traffic at high speed under normal situation. However, whether the bottlenecks are caused by incidents or roadwork, may reduce the capacity of freeway and generate traffic congestion. Soon after an incident happened, if the speed information for the bottleneck could be given to the upstream drivers immediately, which can reduce the emission and fuel consumption, in addition to lowering traffic congestion and travel cost. An analytical procedure to study the effect of freeway bottlenecks is the need for effective traffic control of the road section under construction which is one of the major tasks in the process of freeway construction and maintenance. The purpose of this research is to construct a traffic flow model to describe the characteristics of traffic flow at bottlenecks. In this study, a special case of an uniform two-lane freeway with no entrances or exists, and with bottlenecks is discussed. The mathematical model of the traffic flow describing the dynamic evolution of traffic variables along the normal lane are developed by conservation law and the momentum equation. The models are solved by characteristic method and simulated by adaptive finite difference method. Then, the multilane freeway bottleneck models are extended. Finally, the existence and uniqueness properties of the solutions are also discussed.