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Analysis of the centrifuge acceleration variation concept in the calculation of clothoids through road geometric design regulations in Spain

Profesor interino. Departamento de Ingeniería Mecánica University of the Basque Country UPV / EHU

Contractor profesor. Doctor. Department of Civil Engineering University of Burgos

Eduardo ROJÍ

Profesor titular. Departamento de Ingeniería Mecánica Universidad del País Vasco UPV/EHU 


Transition curves are employed in road projects so as to link tangents and circular curves or circular curves of different radius, being the clothoid the element that is used in the majority of countries. In Spain it is referred as the transition curve to be employed in the road geometric design rules. One of the concepts that is applied in order to determine its minimum length refers to the centrifuge acceleration variation limitation in the horizontal plane. The aim of this paper is to analyze the formulas that had been established by Spanish road geometric design regulations trough time and recommend the use of the equations that best define the concept.


Clothoid, Curve, Route, Geometric design, Transition curve, Geometry, Policy, Centrifuge acceleration.

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