Traffic Platoon Dispersion Modeling on Arterial Streets

Manar, Abdelaziz; Baass, K G

doi:10.1177/0361198196156600106

Cited by 11 publications

(6 citation statements)

References 1 publication

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“…As a result, these intersections operate poorly, especially during peak periods. Various platoon dispersion models have been developed to design effective signal timing and provide coordination between a series of intersections (1)(2)(3)(4)(5). However, these passive systems do not perform well when there are side streets between times at the intersection.…”

Section: Evaluation Of Integrated Platoon-priority and Advance Warninmentioning

confidence: 99%

Evaluation of Integrated Platoon-Priority and Advance Warning Flasher System at High-Speed Intersections

Liu

Bhimireddy

2009

Transportation Research Record: Journal of the Transportation R

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the interconnected intersections or there is unpredictability in traffic demand. Recently, active platoon-priority signal control systems that operate on the basis of real-time traffic conditions have been developed to deal with this problem (6-8).Furthermore, advance warning flashers (AWFs) are used on major approaches at rural high-speed signalized intersections to warn motorists of the end of the green. The conventional method uses a trailing overlap green (9). A fixed-length green hold, typically 7 to 8 s, is placed at the end of the phase. The advance warning beacons located upstream of the intersection start flashing along with the trailing overlap green. In addition, dilemma-zone detectors are used on high-speed approaches to prevent a gap-out when there is a vehicle in the dilemma zone. But when AWFs are used, there is a fixed-length hold over the phase after gap-out and no more green extensions are given afterward. This setup replaces the dilemma-zone protection (DZP) provided by the detectors, and the routinely placed fixed-time hold at the end of the phase increases delay on the minor approach.An advance warning end-of-green system (AWEGS) has been developed by Texas Transportation Institute (TTI) to provide advance warning without the necessity of holding the green (10). Several research studies have been done on the effectiveness of AWF signs. The accident studies conducted on isolated high-speed signalized intersections (11-13) indicated that the advance warning signs are effective in reducing accidents. Although the results of an accident study in Minnesota (14) were mixed, the study recommended advance warning signs on approaches with a posted speed limit of 55 mph or higher.Both platoon-priority and AWEGS have a great deal in common in terms of hardware requirements and operation. Both systems use advance detection to collect information regarding future vehicle arrivals at the intersection and analyze collected information in regard to respective system objectives and, when necessary, override normal signal controller operations to achieve their purpose. However, there has not been a research effort to integrate these systems. The purpose of this research study is to develop and evaluate the benefits of an integrated system that provides platoon priority, advance warning of the end of green, and also DZP at the end of green.The developed system is tested on a cabinet-in-the-loop system with a real scenario to evaluate its benefits. Figure 1 illustrates the integrated system (IS) architecture. Similar architecture has been used in previous studies (7, 10). The IS uses advance detectors and a computer installed with IS software to detect future events such as platoon arrivals and phase detector actuation Most rural or suburban high-speed isolated intersections have higher traffic volumes on the major approach compared with the minor approach. Often these intersections are not close enough to one another to provide coordination and are not far enough apart to disperse vehicle platoons completely on...

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Section: Evaluation Of Integrated Platoon-priority and Advance Warninmentioning

confidence: 99%

Evaluation of Integrated Platoon-Priority and Advance Warning Flasher System at High-Speed Intersections

Liu

Bhimireddy

2009

Transportation Research Record: Journal of the Transportation R

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“…III. DECOUPLING OF PARTICLE MODEL [4][5][6] In the signal control system of transportation, traffic detectors are embedded in intersections, which can detect traffic flow in all diversion and phases, such as ) (…”

Section: Correlative Flow Of Intersectionsmentioning

confidence: 99%

“…Once the vehicles queuing up enter into upstream exit line, we can take them as the vehicles, which queue up in section no matter when they arrive. So, the formula (2)(3)(4)(5) can be simplified to be composed of green light flow rate sequence in each phase of upstream junction. …”

Section: Vehicle Storage Effect Of Sectionmentioning

confidence: 99%

Decouple Analysis on Distributed Architecture of Urban Traffic System

Weng

Gao-Li

et al. 2006

2006 9th International Conference on Control, Automation, Robotics and Vision

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The establishment of traffic model suitable for ITS is an important aspect to promote the rapid development of urban traffic. The paper develops an urban traffic particle model based on practical observation of traffic flow, in which intersection is regarded as elementary granular unit and there are decoupled relations among them. Then the exercise mechanism of traffic flow is introduced, and a correlative model and its decoupled method are argued between units. Finally the paper takes practical data of two adjacent intersections for example. Signal cycle, traffic flows of each phase are used to analyze stability of elementary unit as time scale, state variables. Through computer simulation and analysis, modeling distributed traffic particle flow is feasible; the model provides theories basis for distributed architecture of intelligent transport system of cities.

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“…Robertson's model in TRANSYT implies dispersion by the platoon dispersion factor for three external friction levels. Manar and Baass [18] demonstrate that platoon dispersion depends not only on external friction but also on internal friction measured by volume and density and developed mathematical models relating platoon dispersion to internal and external frictions. G. C. K. Wong and S. C. Wong [19] developed a multiclass traffic flow model as an extension of the LWR model, which considered the heterogeneous drivers.…”

Section: Introductionmentioning

confidence: 99%

Mixed Platoon Flow Dispersion Model Based on Speed-Truncated Gaussian Mixture Distribution

Jin

Shen

2013

Journal of Applied Mathematics

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A mixed traffic flow feature is presented on urban arterials in China due to a large amount of buses. Based on field data, a macroscopic mixed platoon flow dispersion model (MPFDM) was proposed to simulate the platoon dispersion process along the road section between two adjacent intersections from the flow view. More close to field observation, truncated Gaussian mixture distribution was adopted as the speed density distribution for mixed platoon. Expectation maximum (EM) algorithm was used for parameters estimation. The relationship between the arriving flow distribution at downstream intersection and the departing flow distribution at upstream intersection was investigated using the proposed model. Comparison analysis using virtual flow data was performed between the Robertson model and the MPFDM. The results confirmed the validity of the proposed model.

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Traffic Platoon Dispersion Modeling on Arterial Streets

Cited by 11 publications

References 1 publication

Evaluation of Integrated Platoon-Priority and Advance Warning Flasher System at High-Speed Intersections

Evaluation of Integrated Platoon-Priority and Advance Warning Flasher System at High-Speed Intersections

Decouple Analysis on Distributed Architecture of Urban Traffic System

Mixed Platoon Flow Dispersion Model Based on Speed-Truncated Gaussian Mixture Distribution

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