Effects of capacity and transit improvements on traffic and transit operations

Shams, Andalib; Zlatkovic, Milan

doi:10.1080/03081060.2020.1780710

Cited by 13 publications

(6 citation statements)

References 4 publications

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“…urban traffic management strategies such as widening roads, optimising road signalling and tightening lawenforcement [51,52,53,54]. Ironically, evidence from other world cities suggests that building freeways and roads around cities only increases car dependence and thus intensifies congestion and pollution [52].…”

Section: Overview Of Earlier Studies and Approachesmentioning

confidence: 99%

Walking on sunshine: Pairing electric vehicles with solar energy for sustainable informal public transport in Uganda

Booysen

Abraham

Rix

et al. 2022

Energy Research & Social Science

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Minibus taxi public transport is a seemingly chaotic phenomenon in the developing cities of the Global South with unique mobility and operational characteristics. Eventually this wide-spread fleet of minibus taxis will have to transition to electric vehicles. This paper examines the impact of this inevitable evolution on a city-wide scale in Kampala, Uganda. We present a generic simulation environment to assess the grid impact and charging opportunities, given the unique paratransit mobility patterns. We used floating car data to assess the energy requirements of electric minibus taxis, which will have a knock-on effect on the region's already fragile electrical grid. We used spatio-temporal and solar photovoltaic analyses to assess the informal and formal stops that would be needed for the taxis to recharge from solar PV in the region's abundant sunshine. The results showed that the median energy demand across all simulated days of the fleet of taxis was 220 kWh/d. This ranged to a maximum of 491 kWh/d, with a median charging potential (stationary time) across taxis of 8 h/d to 12 h/d. The median potential for charging from solar PV ranged from 0.24 kWh/m 2 to 0.52 kWh/m 2 per day, across the taxis. Our simulator and results will allow traffic planners and grid operators to assess and plan for looming electric vehicle roll-outs to the most-used mode of transport in Africa.

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Section: Overview Of Earlier Studies and Approachesmentioning

confidence: 99%

Walking on sunshine: Pairing electric vehicles with solar energy for sustainable informal public transport in Uganda

Booysen

Abraham

Rix

et al. 2022

Energy Research & Social Science

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show abstract

“…Another paper proved the design methodologies for providing pedestrian access and related pedestrian signal timings can optimize vehicular traffic performance [35]. In addition, how an Intelligent Transportation System (ITS) technology, named Transit signal priority (TSP), affects CFI design was studied [45]. A dynamic optimized method of traffic signal timing parameters was proposed considering the coordination of traffic signals between main intersections and crossovers at a CFI [34].…”

Section: Signal Control Of Cfimentioning

confidence: 99%

Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

et al. 2021

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As an unconventional design to alleviate the conflict between left-turn and through vehicles, Continuous Flow Intersection (CFI) has obvious advantages in improving the sustainability of roadway. So far, the design manuals and guidelines for CFI are not enough sufficient, especially for the displaced left-turn lane length of CFI. And the results of existing research studies are not operational, making it difficult to put CFI into application. To address this issue, this paper presents a methodological procedure for determination and evaluation of displaced left-turn lane length based on the entropy method considering multiple performance measures for sustainable transportation, including traffic efficiency index, environment effect index and fuel consumption. VISSIM and the surrogate safety assessment model (SSAM) were used to simulate the operational and safety performance of CFI. The multi-attribute decision-making method (MADM) based on an entropy method was adopted to determine the suitability of the CFI schemes under different traffic demand patterns. Finally, the procedure was applied to a typical congested intersection of the arterial road with heavy traffic volume and high left-turn ratio in Xi’an, China, the results showed the methodological procedure is reasonable and practical. According to the results, for the studied intersection, when the Volume-to-Capacity ratio (V/C) in the westbound and eastbound lanes is less than 0.5, the length of the displaced left-turn lanes can be selected in the range of 80 to 170 m. Otherwise, other solutions should be considered to improve the traffic efficiency. The simulation results of the case showed CFI can significantly improve the traffic efficiency. In the best case, compared with the conventional intersection, the number of vehicles increases by 13%, delay, travel time, number of stops, CO emission, and fuel consumption decrease by 41%, 29%, 25%, 17%, and 17%, respectively.

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“…Simpang merupakan salah satu titik di mana pengaturan yang tepat bisa mencegah kemacetan yang bisa berdampak pada seluruh jaringan transportasi (Shams & Zlatkovic, 2020). Simpang menjadi titik kritis dalam regulasi lalu lintas karena merupakan pertemuan berbagai arus kendaraan.…”

Section: Pendahuluanunclassified

The Optimalisasi Kinerja Simpang Lalu Lintas: Studi Transformasi Dari Simpang Tidak Bersinyal ke Simpang Bersinyal

Prasetyo

2024

JUTEKS

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This research explores the transformation of unsignalized intersections into signalized intersections as a strategy to increase efficiency and safety in traffic management. The main objective of the research is to evaluate the impact of these changes on vehicle flow, traffic density, accidents, and travel time efficiency. The research method was carried out through a combination of field observations, traffic volume data collection, statistical analysis, and simulation modeling. The results showed significant changes after the intersection transformation, with a significant increase in the average speed of traffic flow and a reduction in density during rush hours. In addition, accident analysis shows a decrease in the number of traffic incidents that occurred after the implementation of the signalized intersection system, indicating increased safety for road users. The results of this research show that the transformation of unsignalized intersections into signalized intersections has a significant positive impact in optimizing traffic performance. This research makes an important contribution to the understanding of the benefits of changes to traffic infrastructure and provides a basis for decision making in improving urban transport systems. The implications of this research can be used as a guide for policy makers in planning similar transformations in other locations to improve overall traffic system performance. Keywords: Traffic performance, signalized intersections, optimization Abstrak Penelitian ini mengeksplorasi transformasi yang dilakukan pada simpang tak bersinyal menjadi simpang bersinyal sebagai strategi untuk meningkatkan efisiensi dan keamanan dalam pengaturan lalu lintas. Tujuan utama penelitian adalah untuk mengevaluasi dampak dari perubahan ini terhadap aliran kendaraan, kepadatan lalu lintas, kecelakaan, serta efisiensi waktu perjalanan. Metode penelitian dilakukan melalui kombinasi observasi lapangan, pengumpulan data volume lalu lintas, analisis statistik, dan pemodelan simulasi. Hasil penelitian menunjukkan adanya perubahan yang signifikan setelah transformasi simpang, dengan peningkatan yang signifikan dalam kecepatan rata-rata aliran lalu lintas dan pengurangan kepadatan pada jam-jam sibuk. Selain itu, analisis kecelakaan menunjukkan penurunan jumlah insiden lalu lintas yang terjadi setelah penerapan sistem simpang bersinyal, menandakan adanya peningkatan keamanan bagi pengguna jalan. Hasil dari penelitian ini menunjukkan bahwa transformasi simpang tak bersinyal menjadi simpang bersinyal memiliki dampak positif yang signifikan dalam mengoptimalkan kinerja lalu lintas. Penelitian ini memberikan kontribusi penting terhadap pemahaman tentang manfaat dari perubahan infrastruktur lalu lintas serta memberikan landasan bagi pengambilan keputusan dalam meningkatkan sistem transportasi perkotaan. Implikasi dari penelitian ini dapat digunakan sebagai panduan bagi pembuat kebijakan dalam merencanakan transformasi serupa di lokasi lain untuk meningkatkan kinerja sistem lalu lintas secara keseluruhan. Kata Kunci: Kinerja lalulintas, Simpang Bersinyal, Optimalisasi

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Effects of capacity and transit improvements on traffic and transit operations

Cited by 13 publications

References 4 publications

Walking on sunshine: Pairing electric vehicles with solar energy for sustainable informal public transport in Uganda

Walking on sunshine: Pairing electric vehicles with solar energy for sustainable informal public transport in Uganda

Evaluation and Analysis of CFI Schemes with Different Length of Displaced Left-Turn Lanes with Entropy Method

The Optimalisasi Kinerja Simpang Lalu Lintas: Studi Transformasi Dari Simpang Tidak Bersinyal ke Simpang Bersinyal

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