Part 2: Context-Sensitive Design and Solutions: Context-Sensitive Solutions: Training Experience

Townsend, Teresa; Lane, Leigh; Martin, James B.

doi:10.3141/1904-07

Cited by 2 publications

(1 citation statement)

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“…If an acceptable solution can be reached only with reference to design value marginally outside normal design criteria, it would be important that designers and a transportation agency had a right instrument to measure where, to what extent and under what conditions, eventually, to accept the proposed exception (Townsend et al 2005;Crossett, Oldham 2005).…”

Section: Introductionmentioning

confidence: 99%

Context Sensitive Solutions Using Interval Analysis / Kontekstiniai Sprendimai, Naudojant Intervalinę Analizę / Контекстные Решения С Использованием Интервального Анализа

2011

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The term 'Context Sensitive Solutions' was adopted by the Federal Highway Administration in 1997 and is a synonym of flexibility that allows the designer to balance the safety, mobility and preservation of environmental resources. When the optimal use of design criteria produces an unacceptable solution, the correct application of design value outside the current guidelines with a particular attention to safety and legal risk is needed. In this case, a feasible alternative meets the purpose of design and is considered constructible and maintainable within social, economic and environmental constraints. Unlike in many other countries, road standards in Italy do not permit to work out a simple solution to the problem of flexibility. Speciflcally, one of the most debated subjects, concerning the items of the Italian Ministerial Decree (MD) 5/11/2001 confer with a designer the possibility of deviating from prescriptive obligations on condition to suggest some appropriate safety analysis. However, it does not indicate any methodology to objectively quantify removal eflect from the reference values established by the rule. At this purpose, the paper suggests an analytical instrument for controlling design values outside the current guidelines applying a methodology based on interval analysis, a technique generally used for managing uncertain variables. The procedure applied to designing a planimetric curve has identified the most significant variables and produced some range in which they may be retained acceptable, though outside the limits of the geometric standard.

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Section: Introductionmentioning

confidence: 99%

Context Sensitive Solutions Using Interval Analysis / Kontekstiniai Sprendimai, Naudojant Intervalinę Analizę / Контекстные Решения С Использованием Интервального Анализа

2011

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Interval analysis applied to road standard controls

Bosurgi¹,

D’Andrea²,

Pellegrino³

2015

Proceedings of the Institution of Civil Engineers - Transport

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This paper deals with the application of an analytical technique known as ‘interval analysis’ to the usual audits contained in international road standards. Generally, a design solution is constrained by a number of parameters (dependent on the morphology of territory, on existing conditions, on type of road, etc.) that, materially, cannot exceed certain values. Although the final choice is respectful of these constraints, the ordinary calculation techniques do not allow use of the full potential of the most critical variables. In order to determine all the possible solutions of the problem, the so-called interval analysis, which is generally used to treat uncertain problems when only the limits of existence of uncertain variables but not their probabilistic characteristics are known, was used. The application to the visibility of a horizontal curve has allowed different solutions to be identified, by starting from the knowledge of the range of existence of one or more input variables and isolating the result which was more convenient for that specific situation. This procedure is easily applicable to the design of new or existing roads, especially when one or more variables of the problem are close to the threshold imposed by the standards.

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Part 2: Context-Sensitive Design and Solutions: Context-Sensitive Solutions: Training Experience

Cited by 2 publications

References 1 publication

Context Sensitive Solutions Using Interval Analysis / Kontekstiniai Sprendimai, Naudojant Intervalinę Analizę / Контекстные Решения С Использованием Интервального Анализа

Context Sensitive Solutions Using Interval Analysis / Kontekstiniai Sprendimai, Naudojant Intervalinę Analizę / Контекстные Решения С Использованием Интервального Анализа

Interval analysis applied to road standard controls

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