Evaluation of Existing Performance and Potential for Optimization of Traffic Signals in Karachi

Ahmed, Afzal; Mehdi, Mohammed Raza; Rizvi, Syed Muzammil Abbas; Fatima, Tehniyat

doi:10.1007/s13369-019-03901-y

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…Moreover, bilevel programming-based research was conducted [10][11][12], and each level considered traffic signal, stochastic user equilibrium, total travel time, capacity, and vehicle emission [11]. In addition, other concepts, such as the cell transmission model and lane change models, have been applied to find the optimal signal timing for enhancing intersection capacity [13,14].…”

Section: Introductionmentioning

confidence: 99%

Optimized Intersection Signal Timing: An Intelligent Approach-Based Study for Sustainable Models

Javeed

Bae

et al. 2022

Sustainability

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With the development of intelligent transportation systems, research into intelligent traffic signal control has received considerable attention. To date, many traffic signal control models have been studied, where most of the models concentrate on how to minimize travel time, vehicle delay, and the number of stops or how to maximize capacity. This study introduces the Garra Rufa–inspired (GRI) algorithm, which is used to optimize traffic signal control modelling considering the number of vehicles in a queue. GRI has the characteristics of using the decision variables of the code as the operation object, directly using the objective function value for the search information, using multiple search points at the same time, and using probability search technology. Theoretical analysis of intelligent optimization and research into application methods were carried out to resolve the problem of traffic signal optimization control. The output of the GRI algorithm was compared, calibrated, and validated with SIDRA. Furthermore, to obtain more comprehensive results, the genetic algorithm (GA) and particle swarm optimization (PSO) were also compared. The results of the analysis show that the GRI decreases by 10.1% (intersection A) and 16.5% (intersection B) in the number of vehicles in the queue.

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Section: Introductionmentioning

confidence: 99%

Optimized Intersection Signal Timing: An Intelligent Approach-Based Study for Sustainable Models

Javeed

Bae

et al. 2022

Sustainability

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“…In this situation, commuters experience problems in comfort, availability, accessibility, and safety which trigger commuters to switch to either private vehicles or paratransit/e-hiring services. The lack of a proper public transport system resulted in increased dependency on motorbikes and cars [5,6] which contributes to more traffic congestion [7,8]. The number of motorbikes registered in Karachi has increased by 50% during a period of four years from 2013 to 2017, whereas the number of cars has increased by 38% during the same period [9].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of public transport modes available in Karachi, Pakistan

2020

Self Cite

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This study presents a comparative analysis of selected parameters of existing formal and informal Public Transport (PT) modes being operated on three different types of fuels. The performance of PT modes is analysed on fuel consumption, capacity, transportation cost, and emissions resulting from these modes. The required data were collected using route-check survey method and conducting a questionnaire-based survey from drivers and operators of these modes. Furthermore, the performance of proposed buses for an under-construction BRT corridor is also evaluated and compared with the existing PT modes. The comparative analysis of the existing PT modes in Karachi shows that CNG operated PT modes are economically more efficient, which caused the conversion of diesel engines of buses and minibuses to CNG fuelled-engines. The study, for the first time, evaluates and compares the performance of informal PT mode (chingchi) with other modes of PT. Results show that the PT modes with less capacity, such as chingchi, should be discouraged due to their comparatively lower performance on the selected parameters. This study can be used by the authorities to analyze the performance of existing modes and prioritize the PT modes for future planning.

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“…The results showed that the intersections on the south corridor have lower LOS levels ranging from C to F whereas the north corridor currently carries less traffic, which resulted in LOS ranging from C to E on peak hour. Ahmed et al (2019) used Cell Transmission Model (CTM) to deter mine optima l signal plans based on control delay at two different locations in Karachi. The study concluded that optimum signal timings can reduce delays and improve the operational performance of traffic network.…”

Section: Introductionmentioning

confidence: 99%

Measures to Improve Traffic Operations at Signalized Intersections in Urban Areas

2019

IJTTE

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Intersections are usually considered the most complex locations in the road network. They have a very considerable effect on operational performance of road traffic. Traffic signals at intersections have a significant effect on traffic operations. Therefore, the objective of this research is to set measures for improving the traffic operations at signalized intersections in urban areas. Two 3-legged intersections located in Mansoura City, Egypt were selected in this study. Vehicle speed and acceleration profiles obtained using GPS device were used to estimate delay times. The micro-simulation software VISSIM was used to model and analyze the selected intersections. The field collected data were used in the calibration and validation processes. The study investigated three scenarios using the developed models; Scenario 0 (original scenario), Scenario 1 (optimization of signal cycle time) and Scenario 2 (increasing of lane width). The evaluation was conducted based on average delay values and LOS. The simulation results indicated that Scenario 1 and Scenario 2 can reduce the delay values resulting the better LOS values from D to C for both selected intersections. Moreover, Scenario 1 exhibited lower delay values than other scenarios for both intersections.

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Evaluation of Existing Performance and Potential for Optimization of Traffic Signals in Karachi

Cited by 6 publications

References 37 publications

Optimized Intersection Signal Timing: An Intelligent Approach-Based Study for Sustainable Models

Optimized Intersection Signal Timing: An Intelligent Approach-Based Study for Sustainable Models

Comparative analysis of public transport modes available in Karachi, Pakistan

Measures to Improve Traffic Operations at Signalized Intersections in Urban Areas

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