591,085 research outputs found

    A Road Description Language for the Leeds Driving Simulator Guide (V1.0)

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    A driving simulator has recently been developed at the University of Leeds. Part of this work has been to provide a method of creating a wide variety of road networks to meet the demands of different experiments. This paper describes a simple language that specifies road networks and their appearance, including the definition of road markings, sign posts and roadside objects. It is intended for use by prospective users of the simulator facility in order that they could either build networks themselves or know what information is required for simulator staff to build a network for them

    Multiple domination models for placement of electric vehicle charging stations in road networks

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    Electric and hybrid vehicles play an increasing role in the road transport networks. Despite their advantages, they have a relatively limited cruising range in comparison to traditional diesel/petrol vehicles, and require significant battery charging time. We propose to model the facility location problem of the placement of charging stations in road networks as a multiple domination problem on reachability graphs. This model takes into consideration natural assumptions such as a threshold for remaining battery load, and provides some minimal choice for a travel direction to recharge the battery. Experimental evaluation and simulations for the proposed facility location model are presented in the case of real road networks corresponding to the cities of Boston and Dublin.Comment: 20 pages, 5 figures; Original version from March-April 201

    Scale Invariance in Road Networks

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    We study the topological and geographic structure of the national road networks of the United States, England and Denmark. By transforming these networks into their dual representation, where roads are vertices and an edge connects two vertices if the corresponding roads ever intersect, we show that they exhibit both topological and geographic scale invariance. That is, we show that for sufficiently large geographic areas, the dual degree distribution follows a power law with exponent 2.2 < alpha < 2.4, and that journeys, regardless of their length, have a largely identical structure. To explain these properties, we introduce and analyze a simple fractal model of road placement that reproduces the observed structure, and suggests a testable connection between the scaling exponent alpha and the fractal dimensions governing the placement of roads and intersections.Comment: 6 pages, 10 figures; revision incorporates more rigorous statistical analyses; matches journal versio
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