A Time-Dependent TRANSYT Traffic Model for Area Traffic Control

Wong, Stephen C. P.; Wong, Wai-Tak; Xu, Jie; Tong, CO

doi:10.1061/40503(277)90

Cited by 11 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Himalayan region, Karmacharya et al (2018) noted that western Nepal, notably Bardya National Park, is a poaching hotspot. Considered the flagship species in human-populated landscapes, tigers face many threats, including illegal poaching for the illicit trade of tiger body parts (Campbell et al, 2019; Wong & Krishnasamy, 2019). Retaliatory killings in response to livestock predation and human fatalities are other threats to tigers in the Terai Arc Landscape and the Himalayas (Lamichhane et al, 2017).…”

Section: Synthesis and Interpretationmentioning

confidence: 99%

“…The spatial overlap of tigers and human-dominated landscapes results in human–tiger conflict, often leading to livestock depredation, human injury and retaliatory killing of tigers (Letro & Fischer, 2020). Poaching, a significant threat, is fuelled by an increasing demand for tiger body parts and derivatives in South-east Asia and elsewhere (Wong & Krishnasamy, 2019). Conservation efforts aim to mitigate these threats and increase the species’ resilience and population size.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A systematic scoping review of tiger conservation in the Terai Arc Landscape and Himalayas

Yadav

Brownlee

Kapoor

2022

Oryx

View full text Add to dashboard Cite

In the last decade the tiger Panthera tigris population in the Terai Arc Landscape and Himalayas has increased, while populations in other countries have remained below their conservation targets. Although there has been some research on tiger conservation in the Terai Arc Landscape and the Himalayas, scientists and managers have not catalogued and characterized tiger research in the region, with empirical findings scattered among disparate document types, journals and countries. Without a review of the tiger research in the Terai Arc Landscape and Himalayan region, it is difficult to analyse or change conservation policies, develop adaptation strategies, prioritize research, allocate resources or develop conservation strategies potentially employable elsewhere. We therefore conducted a systematic scoping review to identify focal research areas, the spatial and temporal distribution of study sites, general publication trends, the extent of empirical studies, and gaps in tiger conservation research in this region (which spans Bhutan, India and Nepal). Since 2000, 216 studies have been published on issues associated with tiger conservation in the Terai Arc Landscape and Himalayas, with an increasing number over time. Most empirical studies have focused on tiger habitat, ecology and conflicts in protected areas in the region's foothills. There are research gaps in high-altitude landscapes, social science investigations, conservation economics, and policy and institutional analyses.

show abstract

Section: Synthesis and Interpretationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A systematic scoping review of tiger conservation in the Terai Arc Landscape and Himalayas

Yadav

Brownlee

Kapoor

2022

Oryx

View full text Add to dashboard Cite

show abstract

“…Heydecker (1996) decomposed the optimization of traffic signal timings into two levels; first, optimizing the signal timings at the individual junction level using the group-based approach, and second, combining the results from individual junction level with network level decision variables such as offset and common cycle time. Wong et al (2000) developed a time-dependent TRANSYT traffic model for the evaluation of PI. It was found that the time-dependent model produces a reasonable estimate of PI for under saturated to moderately oversaturated conditions.…”

Section: Introductionmentioning

confidence: 99%

An Ant Colony Optimization Algorithm for Area Traffic Control

Haldenbilen¹,

Başkan²,

Ozan³

2013

Ant Colony Optimization - Techniques and Applications

View full text Add to dashboard Cite

runs, using the TRANSYT-7F simulation engine. Each simulation run is assigned a unique signal timing plan by the optimization processor. The optimizer applies the Hill-Climbing (HC) or Genetic Algorithm (GA) searching strategies. The trial simulation run resulting in the best performance is reported as optimal. Although the GA is mathematically better suited for determining the absolute or global optimal solution, relative to HC optimization, it generally requires longer program running times, relative to HC optimization [4]. This chapter proposes Ant Colony Optimization (ACO) based algorithm called ACORSES proposed by [5] for finding optimum signal parameters in coordinated signalized networks for given fixed set of link flows. The ACO is the one of the most recent techniques for approximate optimization methods. The main idea is that it is indirect local communication among the individuals of a population of artificial ants. The core of ant's behaviour is the communication between the ants by means of chemical pheromone trails, which enables them to find shortest paths between their nest and food sources. This behaviour of real ant colonies is exploited to solve optimization problems. The proposed algorithm is based on each ant searches only around the best solution of the previous iteration with reduced search space. It is proposed for improving ACO's solution performance to reach global optimum fairly quickly. In this study, for solving the ATC problem, Ant Colony Optimization TRANSYT (ACOTRANS) model is developed. TRANSYT-7F traffic model is used to estimate total network PI.

show abstract

“…It coordinates the traffic signals among adjacent junctions to improve the operational performance of a signalcontrolled network. The optimization of signal plans for signalcontrolled networks has been thoroughly studied (Allsop, 1968a,b;Gartner, 1974;Hillier, 1965Hillier, , 1966 Lo, 1999Lo, , 2001Robertson, 1969;Traffic Research Corporation, 1966;Vincent el al., 1980;Wong, 1995Wong, , 1996aWong, , 1997Wong et al, 2002). For combined signal settings and assignment problems, Allsop (1 974) was among the first to suggest that signal control could be explored to affect the distribution and assignment of trafic on an equilibrium network, and he provided a rigorous C.K.…”

Section: Introductionmentioning

confidence: 99%

Lane‐based optimization of traffic equilibrium settings for area traffic control

Wong¹,

Wong²

2002

J of Advced Transportation

Self Cite

View full text Add to dashboard Cite

Area traffic control is an important element in Intelligent Transportation System (ITS). This paper extends the lane-based optimization method to a traffic equilibrium network. which improves the operational performance of signal-controlled network. We formulate a decomposition approach to simultaneously optimize the lane markings and signal settings for a signal-controlled network that comprises two levels of optimization. At the junction level, the lane markings, control sequence, and other aspects of the signal settings are optimized for individual junctions, whereas at the network level, the groupbased signal settings are optimized to take into account the re-routing characteristics of travelers and signal coordination effects that are based on a TRANSYT traffic model, which is a well-known procedure for evaluating the performance of signal-controlled networks. We use a numerical example to demonstrate the effectiveness of the proposed methodology.

show abstract

A Time-Dependent TRANSYT Traffic Model for Area Traffic Control

Cited by 11 publications

References 8 publications

A systematic scoping review of tiger conservation in the Terai Arc Landscape and Himalayas

A systematic scoping review of tiger conservation in the Terai Arc Landscape and Himalayas

An Ant Colony Optimization Algorithm for Area Traffic Control

Lane‐based optimization of traffic equilibrium settings for area traffic control

Contact Info

Product

Resources

About