Evaluating the Environmental Benefits of Median Bus Lanes: Microscopic Simulation Approach
- Authors
- Kim, Daejin; Ko, Joonho; Xu, Xiaodan; Liu, Haobing; Rodgers, Michael O.; Guensler, Randall
- Issue Date
- Apr-2019
- Publisher
- SAGE PUBLICATIONS INC
- Citation
- TRANSPORTATION RESEARCH RECORD, v.2673, no.4, pp.663 - 673
- Indexed
- SCIE
SCOPUS
- Journal Title
- TRANSPORTATION RESEARCH RECORD
- Volume
- 2673
- Number
- 4
- Start Page
- 663
- End Page
- 673
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/148050
- DOI
- 10.1177/0361198119836982
- ISSN
- 0361-1981
- Abstract
- Median bus lanes are an important element of bus rapid transit (BRT) systems, and can improve traffic operations by separating bus traffic from the traffic in general-purpose lanes. Thus, the operation of BRT systems with dedicated bus lanes is expected to reduce energy consumption and produce positive environmental impacts to a substantial degree. This study attempts to quantify the impacts for a corridor in Seoul, South Korea where frequent bus services are provided, using an integrated simulation tool composed of a microscopic traffic model and a vehicle emissions simulator. This approach has rarely been applied for evaluating the environmental benefits of BRT systems. Given a high volume of bus traffic, the simulation results reveal that corridor energy consumption can be reduced by 18.5% and emissions can be reduced by 1 9.3-31.4%, depending on the pollutant (CO, CO2, PM10, PM2.5, NOx). Vehicles in general-purpose lanes contribute 99.0% of the emissions reductions, with the remaining 1.0% contributed by transit buses. Considering that vehicles in general-purpose lanes represent 94% of corridor traffic, and provide 99.0% of the emission reduction contribution, the simulations suggest that median bus lanes benefit not only the bus operations, but also significantly improve the traffic flow in the general-purpose lanes, contributing to the overall corridor emissions reductions.
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