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Title: Modelling Bus Priorities In A Motorcycle-Dominated Environment
Author: Tran Huu, Minh
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2007
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In recent years, much international interest has been shown in bus running ways, the most common ofwhich are nearside bus lanes and median bl1s ways. Bus lanelbus ways' are under consideration in many developing cities in A~ia ~d ibis nrlses the question how bus lane priorities will 'work in motorcycle-dominated conditions in those cities. This is the main motivation for this research . By using mesoscopic simulation techniques in SATURN model to compare different bus lanelbus way schemes designed for motorcycle-dominated traffic, effects of bus lanelbus way in terms of travel time savings are revealed. Hanoi was selected as th~ case study as it is dominated by motorcycles. In the model for the case study, there are 1108 links in the buffer network and there are 322 simulated .\. junctions. Among simulation nodes are 108 traffic signalized junctions. There are 94 zones in the model. Performance indicators were used in evaluation. Effects of bus lanelbusway designs were evaluated. for both bus users and non-bus users. The success of a design is measured against following main criteria: (1) improvement to bus service (travel time savings on the corridor) (2) effect in the whole network (average network delay/person) and (3) environmental impact (eOi emission). Other indicators are provided for traffic managem~nt purpose. The findings for the case study of Hanoi can be summarized as follows: (1) Motorcycle . encroachment has a big impact on bus lane performance therefore the chance to su'cceed with busways is much higher than with bus lanes.. (2) Ifenforcement is maintamed, it is recommended, for Hanoi, that bus lanes (with setbacks) are used in the city centre. (3) A shorter setback length (compared with car traffic) is recommended. (4) 'YIhere one-way streets exist, it is recommended to consider contra flow bus lane in motorcycledominated traffic. (5) Busways on existing c~age ways can lead to serious congestion for general traffic if they are not weB-implemented, .given that they take much road space away from general traffic. Thus signalized junctions (in the vicinity of. the . busway) and turning bans (for general traffic) need to be well-designed. It .is . . recommended, for Hanoi, that busways are used on arterial roads. A ban on opposite left turn traffic is recommended. (6) A simple combinat~on of the ~est running designs for certain areas might not produce the best 'result in terms of delay/pcu, but gives very good results in terms of delay/person (7) The negative effect of bus lane/busway on general traffic is very sensitive to motorcycle mode switching. (8) The negative effect~ . . . of a bus priority are considerably reduced when non-bus traffic (in this case mostly motorcyclists) can use alternative routes. The key-fa.ctortocreate success of a bus priority is motorcycle mode switching. This is particularly relevant to busway scheme. With no mode switching, most busway designs fail. While previous work is categorized into two types where (1) motorcycles are ailowed to use bus lane or (2) motorcycle encroachment' is ignored, this research focuses on a special environment:. motorcycle dominated traffic in which a large number of motorcycles violate bus lane. This feature much affects performance of bus lanes and . .\. therefore there is a need to consider self-enforcing solution such as bus ways. In the context where successful operation of bus lane/bus ways in motorcycle-dominated traffic is questionable, the research provided deep insights into effects . . of different bus priorities in motorcycle-dominated traffic. It investigates and explains how bus lane/bus ways affect traffic system in motorcycle context and how motorcycles react to a bus priority. The result can be used to support the decision making of implementation ofbus lane/bus ways in low-income country cities dominated by motorized vehicles. While many studies either (1) ignore effects of motorcycles in modelling bus 'lane/bus way (with macro .approach) or (2) ignore the impacts in large networks (with micro approach),' this study's use of mesoscopic modelling techniques to model mo~orcycledominated traffic in a reasonably large network is an innovation. Techniques developed in the research can be used when mesoscopic model is applied in motorcycle-dominated traffic - a challeng~ for many transport modellers for the time being.' The main new finding is that: in motorcycle-dominated traffic, bus lanes are likely to be a failure and busways should be used instead. However, motorcycle mode switching is also necessary to assure the success. Without one of these factors, there will be no (or very limited) improvement.
Supervisor: Not available Sponsor: Not available
Qualification Name: University of Leeds, 2007 Qualification Level: Doctoral
EThOS ID:  DOI: Not available