Review of the publication titled "Route Choice and Signal Control: The potential for Integrated Route Guidance" by Tom Van Vuren and Dirck Van Vliet. (Institute for Transport Studies Series, No.5)
The estimation of arrival headways is fundamental to the modelling of gap acceptance processes for estimating capacities of sign-controlled traffic streams, roundabout entry streams and filter turns at signalised intersections. It is also essential in modelling both vehicle-actuated signal timings and queuing at all types of intersections for performance prediction. This paper considers a class of arrival headway distributions known as negative exponential, shifted negative exponential and bunched exponential. A description of the bunched exponential arrival headway distribution is presented
This paper discusses a delay model for variable demand conditions. The model is applicable to the entire range of expected operations, including highly oversaturated conditions with initial queues at the start of the analysis period. The model is used to clarify issues related to the determination of the Peak Flow Period, as well as the periods immediately preceding and following the peak. While the model is for signalized intersections, the issues discussed about variable demand modelling apply to other types of intersection generally. Flow rates for the Peak Flow Period and the non-peak
Some initial formulations of general overflow delay formulas that can be applied to isolated intersection approaches as well as those contained in a signalized arterial network are discussed. The main issues addressed are the deficiencies in models of arrival that have been developed to account for the filtering effect of upstream signals, which use the Poisson arrival process as their foundation. A cycle-by-cycle simulation model is the investigation tool. This level of modelling allows for the estimation of the uniform and overflow delay components separately. The results of the model are
A deterministic oversaturation queueing model that uses a generalization of the peak hour factor concept of the U.S. Highway Capacity Manual (HCM) as a simple variable demand model is described. The model is used to explore several issues related to oversaturation models. In particular, the relationship between the delay measurement methods (queue sampling and path trace) and the delay definitions used in the corresponding analytical delay models is investigated with a view to level of service assessment and performance prediction. The differences in delay definitions and delay measurement
The predictions of capacity and delay for a single lane entry stream at a single lane roundabout by two simulation models, ModelC and INSECT, and two analytical models, ARRB Special Report 45 (SR 45) and SIDRA, are compared.
This paper presents an analysis of the magnitudes of through car equivalents of heavy vehicles and the factors that influence them. The effect of various vehicles types on the rate of saturation flow at signalised intersections is examined as an integral part of a major research project into saturation flows at signalised intersections in Melbourne. See the paper by CUDDON (1994) on this page.
Progress towards the development of a comprehensive Australian method for the analysis of capacity and performance of roundabouts is reported. The new Australian roundabout design guide to be produced during 1991 will include a significant revision of the current capacity analysis method by the incorporation of the results of Australian research. This method allows for the effects of circulating flows, entry flows and roundabout geometry on gap acceptance parameters. The new Australian roundabout analysis method will be implemented in the SIDRA package which was originally developed for
A travel time function proposed by Davidson for transport planning purposes has been subject to much discussion and efforts of calibration including some controversy over the meaning of its parameters. This paper presents a time-dependent form of the original Davidson function, derived using the coordinate transformation technique. The derivation of the original Davidson function is discussed. A new travel time function is proposed as an alternative to Davidson's function. In the proposed function, the delay parameter takes a meaning consistent with the formulae used for estimating
This Excel application includes calculations and graphs for various travel time functions discussed in this paper - AKÇELIK, R. (1991). Travel Time Functions for Transport Planning Purposes: Davidson's Function, its Time-Dependent form and an Alternative Travel Time Function. Australian Road Research 21 (3), pp 49-59. (Minor revisions: December 2000).
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