Road Traffic Control: TRANSYT and SCOOT

McDonald, M.; Papageorgiou, M.

doi:10.1016/b978-0-08-036203-8.50085-7

Cited by 9 publications

(3 citation statements)

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“…They usually prioritize a unidirectional main flow (e.g. in-or out-bound rush-hour traffic in 'arterials') [79]. Some obvious disadvantages of this classical control approach are:…”

Section: The Classical Control Approach and Its Limitationsmentioning

confidence: 99%

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Self-control of traffic lights and vehicle flows in urban road networks

2008

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Abstract.Based on fluid-dynamic and many-particle (car-following) simulations of traffic flows in (urban) networks, we study the problem of coordinating incompatible traffic flows at intersections. Inspired by the observation of self-organized oscillations of pedestrian flows at bottlenecks [D. Helbing and P. Molnár, Phys. Rev. E 51 (1995) 4282-4286], we propose a self-organization approach to traffic light control. The problem can be treated as multi-agent problem with interactions between vehicles and traffic lights. Specifically, our approach assumes a priority-based control of traffic lights by the vehicle flows themselves, taking into account short-sighted anticipation of vehicle flows and platoons. The considered local interactions lead to emergent coordination patterns such as "green waves" and achieve an efficient, decentralized traffic light control. While the proposed self-control adapts flexibly to local flow conditions and often leads to non-cyclical switching patterns with changing service sequences of different traffic flows, an almost periodic service may evolve under certain conditions and suggests the existence of a spontaneous synchronization of traffic lights despite the varying delays due to variable vehicle queues and travel times. The self-organized traffic light control is based on an optimization and a stabilization rule, each of which performs poorly at high utilizations of the road network, while their proper combination reaches a superior performance. The result is a considerable reduction not only in the average travel times, but also of their variation. Similar control approaches could be applied to the coordination of logistic and production processes.

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“…They usually prioritize a unidirectional main flow (e.g. in-or out-bound rush-hour traffic in 'arterials') [79]. Some obvious disadvantages of this classical control approach are:…”

Section: The Classical Control Approach and Its Limitationsmentioning

confidence: 99%

“…They usually prioritize a unidirectional main flow (e.g. in-or out-bound rush-hour traffic in "arterials") [79].…”

Section: The Classical Control Approach and Its Limitationsmentioning

confidence: 99%

Self-control of traffic lights and vehicle flows in urban road networks

2008

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“…SCOOT is actually the traffic-responsive version of TRANSYT (Robertson, 1969), which is the most popular co-ordinated fixed-time strategy (McDonald and Hounsell, 1991). SCOOT utilises traffic measurements upstream of the network junctions.…”

Section: Co-ordinated Traffic-responsive Control Strategiesmentioning

confidence: 99%

Integrated control of traffic flow in corridor networks

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First of all, I would like to express my gratitude to my supervisor Prof. Markos Papageorgiou. His support and guidance during the preparation of this thesis was exceptionally valuable. Moreover, I would like to thank the members of my advisory committee Assoc. Prof. Athanasios Migdalas and Assoc. Prof. Anastasios Pouliezos.My thanks are also due to the Scottish Executive Road Network Management and Maintenance Division, and the Glasgow City Council for permission to implement the developed strategy to the Glasgow M8 corridor network in Scotland and to publish all the related material. Especially, I would like to thank Mr. Tom McLean and Mr. David Beattie of Glasgow City Council for their great support throughout all the developments. I would also like to thank the SERCO Systems Ltd for the software implementation of the developed strategy at the Glasgow site and the WS Atkins Consultants Ltd for performing the strategy evaluation task.Last, but certainly not least, I would like to thank my husband Vangelis. I am not really sure how many goals I would have achieved, if he was not always standing by me.

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