With an increasing number of transport operators seeking permits to operate nonstandard or purpose-built vehicle types, information is required to assist road authorities to determine which vehicle types could operate on the road network without compromising the safety of other road users. A project was created by ARRB TR to develop guidelines for determining route access for heavy vehicles. This project was developed in conjunction with the state road authorities, the National Road Transport Commission and the transport industry to obtain an understanding of the road space requirements for a range of common vehicle types. This project is the subject of this thesis. Two series of field experiments were conducted with six common heavy vehicle types on public roads west of Parkes NSW. Information collected during these full-scale experiments was used to increase the knowledge of the dynamic behaviour of these vehicles and to develop model route access guidelines. Data obtained from these field experiments also provided information to validate computer models and simulation outputs. This thesis showed that: 1) There was experimental evidence to demonstrate that vehicle lateral movement is excited by differences in vehicle wheelpath profiles (point-by-point pavement crossfall), which make a contribution to trailing fidelity (swept width), offtracking and swept path; 2) Vehicle type and speed are prime influences on the lateral movement of the rear trailer and therefore an important input into the model route access guidelines. Notwithstanding the practical and safety implications of applying different speed limits for various vehicle types, speed is a prime contributor to vehicle lateral movement and should be considered when determining route access; 3) Limited lateral position information suggested that one driver of two vehicle types position the vehicles so that the tyres on the rear trailer track on the sealed pavement and not on the pavement shoulder; 4) Based on a statistical analysis of the data obtained from the small sample which only considered the average crossfall of each test section the relative importance of the key parameters was (highest to lowest), IRI, vehicle speed and vehicle type. It was shown that good estimates of lateral movement can be obtained using a double integration technique of the measured lateral acceleration, without applying compensation for the trailer roll or the pavement crossfall. It is recommended that route access guidelines be developed using the lateral performance of a larger sample of vehicles in each class of heavy vehicles operating over a larger range of road types. The route access guidelines should contain a matrix of information on vehicle type/length, pavement condition roughness/profile and lane width. This would provide operators and regulators with a desk-top assessment tool for determining route access.

Texte remanié de: Habilitationsschrift--Philosophische Fakultät--Universität Zürich, Wintersemester 1999/2000. / Bibliogr. p. 340-360. Index.

Texte remanié de: Diss. Ph. D.--Jewish literature--New York--Jewish theological seminary. / Bibliogr. p. 203-217. Index.

Texte remanié de: Thèse de doctorat--Histoire--Paris 4, 2002. Titre de soutenance : La compagnie de navigation française des messageries maritimes de 1851 à 1914 : entreprise de transport de service public. / En appendice, choix de documents. Bibliogr. p. 689-778. Index. PUPS = Presses de l'Université Paris-Sorbonne.

Thèse de doctorat : Histoire : Lyon 2 : 2000. / Titre provenant de l'écran-titre. Bibliogr.

Reproduction de : Thèse doctorat : Langues, histoire et civilisations des mondes anciens : Lyon 2 : 2006. / Titre provenant de l'écran-titre. Bibliogr.

Network traffic assignment/equilibrium models have been widely used for transportation planning. For traffic management, one is interested on how traffic patterns change dynamically since equilibrium cannot be reached instantaneously. This dissertation focuses on modeling short-term traffic patterns in a transportation network, and addresses these topics: (1) comparison of loading route flows versus link flows, (2) development of a mesoscopic model for loading route flows in a network, (3) estimation of route flows based on the mesoscopic model, and (4) optimizing traffic signal timings based on the estimated route flows.With regard to the first topic, many models propagate flows through a network using link flows and independent turning probabilities (ITP) at nodes. Chapter 2 describes the effects of the ITP assumption on the traffic patterns that occur based on route flow loading; this provides the motivation for using route flows in this research.Route trajectories are the spatial-temporal realizations of vehicle route flow demands. This dissertation proposes a mesoscopic simulation platform where route flows are propagated through the network and dynamic trajectories are computed. Under interrupted and uninterrupted flow conditions, route trajectories from the mesoscopic model are compared with ones from a microscopic model, the latter model being used to provide realistic data since real data at this level of detail is not currently available. Results from both models match well; the corresponding traffic patterns are very similar, both graphically and statistically.In chapter 5, a model is presented for estimating temporal route flow demands when real-time data is available. The model is formulated as a bi-level optimization problem where a least-square model is constructed at the upper level and the mesoscopic model is utilized at the lower level to relate flow demands and route trajectories. Based on real-time measurements, this model estimates dynamic route flows that are consistent with observed traffic patterns. Computational results using a micro-simulator for "real" data show that the model estimates well the route flows loaded in the micro-simulation model.Finally, in chapter 6, a traffic signal control optimizer is developed based on the mesoscopic model and a gradient search to optimize any given performance index such as average delay. A numerical example shows that the optimizer significantly improves the performance index and the approach may be used for on-line traffic signal control.

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Thesis (Ph. D.)--University of Pennsylvania, 1924. / Published also without thesis note. On cover: University of Pennsylvania.

Thèse (M.A.)--Université Laval, 2002. / Bibliogr.: f. 94-104. Publié aussi en version électronique.