Intersection planning in Safer Transportation Network Planning

Safety principles, planning framework, and library information


Hummel, Ton



This report is one in a series of publications, used in the development of the network planning tool ‘Safer Transportation Network Planning' (Safer-TNP). The publications were used to guide the development of planning structures, diagnostic tools, planning recommendations, and research information in the computer tool Safer-TNP. Safer-TNP is a design tool that guides network planners in designing safe transportation networks (or improving safety of existing transportation networks). It provides the practitioner with diagnostic tools, and guiding information. At the moment of publication of this report, Safer-TNP is still being developed. Besides this ‘Intersection planning report', the following reports have been published in this series: -Access management in Safer Transportation Network Planning (Hummel, 2001a); -Route management in Safer Transportation Network Planning (Hummel, 2001b); -Land use planning in Safer Transportation Network Planning (Hummel, 2001c); The information in this report will be used to guide the structure and the programming of different parts of the Safer-TNP tool with respect to intersection planning. Described is, in a step-by-step procedure, what information is needed, and in what way the information should be processed. In the last chapter of the report, background information is provided to give users of the tool guiding information. Because of the specific purpose of this report, its structure and style deviate somewhat from regular research reports. Because the different chapters are used in different stages of the development of Safer-TNP, there is some repetition of information. Furthermore, the information is written in telegraphic style, to simplify the electronic packaging of information in Safer-TNP. Decisions in the design of intersections are often implicitly made in the network planning phase. It is therefore important to consider safety implications of these decisions in this early design phase. A choice for the safer three-legged intersection or the roundabout, should not be made physically impossible in the network design. In this report the safety characteristics of intersection types, intersection spacing, and design characteristics are discussed. Recommendations and guiding information is provided.

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