Design and implementation of efficient transit networks: Procedure, case study and validity test

Estrada, Miquel; Roca-Riu, Mireia; Badia, Hugo; Robusté, Francesc; Daganzo, Carlos F.

doi:10.1016/j.tra.2011.04.006

Cited by 38 publications

(26 citation statements)

References 8 publications

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“…Utilizing this design, a system may have a grid structure in the center of the city where demand densities are higher and a hub-and-spoke network on the peripheries, thereby more efficiently utilizing resources and matching a city's demand. With some adjustments, this model is utilized by Estrada et al (2011) in order to design an efficient, feasible transit network for the city of Barcelona. The results of this optimization serve as the inputs for our cost and GHG emission analysis that is presented in the following section.…”

Section: Transit Network Optimizationmentioning

confidence: 99%

“…Equation 1, below, and those in the Section "Mathematical Program for Network Optimization" in Appendix were developed by Daganzo (2010) and modified by Estrada et al (2011) in order to optimize the transit network system in Barcelona. Figure 1 shows the simplified structure of the model used by Estrada et al (2011) Furthermore, in the Barcelona analysis, these two values were assumed to be equal and, therefore, collapsed into one decision variable, α.…”

Section: Transit Network Optimizationmentioning

confidence: 99%

“…Figure 1 shows the simplified structure of the model used by Estrada et al (2011) Furthermore, in the Barcelona analysis, these two values were assumed to be equal and, therefore, collapsed into one decision variable, α. The stop spacings are represented by s x and s y. Utilizing the aforementioned CA methods, an objective function was developed based on total system costs.…”

Section: Transit Network Optimizationmentioning

confidence: 99%

“…Specifically, we will be looking at a case study of Barcelona. First, we present the parameters that were determined by Estrada et al (2011) when optimizing the bus network. Second, we will present our analysis of both costs and GHG reductions that result.…”

Section: Case Study Findingsmentioning

confidence: 99%

“…Furthermore, the high transit ridership and significance of the bus share in Barcelona suggest relevance in our analysis and findings. Finally, comprehensive information regarding the modeling of an efficient design is available for Barcelona, primarily due to the work developed by Estrada et al (2011). The Barcelona optimization model employed by Estrada et al (2011) expands upon Daganzo's (2010) aforementioned hybrid structure.…”

Section: Case Study Findingsmentioning

confidence: 99%

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Optimizing Urban Bus Transit Network Design Can Lead to Greenhouse Gas Emissions Reduction

Griswold

Sztainer²,

Lee

et al. 2017

Front. Built Environ.

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The high contribution of greenhouse gas (GHG) emissions by the transportation sector calls for the development of emission reduction efforts. In this paper, we examine how efficient bus transit networks can contribute to these reduction measures. Utilizing continuum approximation methods and a case study in Barcelona, we show that efforts to decrease the costs of a transit system can lead to GHG emission reductions as well. We demonstrate GHG emission comparisons between an optimized bus network design in Barcelona and the existing system. The optimization of the system network design involves minimizing system costs and thereby determining optimal network layout and transit frequency. In this case study, not only does the cost-optimal design lead to a 17% reduction in total costs, but even more notably, the optimal design leads to a 50% reduction in GHG emissions. Furthermore, the level of service to the user is not detrimentally affected and, in fact, it is slightly improved. We, therefore, extrapolate and hypothesize that the optimization of transit networks in many cities would result in significant GHG emission reductions. The analysis in this paper specifically focuses on the effects of bus technology with fixed ridership corresponding to the Barcelona case study, but the methods implemented could be easily applied to other transit modes in different cities.

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Section: Transit Network Optimizationmentioning

confidence: 99%