Addressing sight-distance-related safety effects of installing median barriers at horizontal curves of undivided highways under a 3D approach

Santos Berbel, César de and González Gómez, Keila and Castro Malpica, María and Anta, José A. (2018). Addressing sight-distance-related safety effects of installing median barriers at horizontal curves of undivided highways under a 3D approach. In: "5th International Conference on Road and Rail Infrastructure", 17 al 19 de Mayo 2018, Zadar, Croacia. pp. 1067-1073.

Description

Title: Addressing sight-distance-related safety effects of installing median barriers at horizontal curves of undivided highways under a 3D approach
Author/s:
  • Santos Berbel, César de
  • González Gómez, Keila
  • Castro Malpica, María
  • Anta, José A.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 5th International Conference on Road and Rail Infrastructure
Event Dates: 17 al 19 de Mayo 2018
Event Location: Zadar, Croacia
Title of Book: Proceedings of the 5th International Conference on Road and Rail Infrastructure
Date: 2018
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Transporte y Territorio
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Concrete barriers are often installed to separate opposing directions of traffic at hazardous horizontal curves on undivided highways in order to avoid frequent types of crashes such as head-on collisions. Whereas this treatment is effective for preventing head-on crashes, they reduce the available sight distance (ASD). The estimation of sight distance is usually performed under a two-dimensional (2D) approach, despite the three-dimensional (3D) nature of facilities. Radius curve, clearance and trajectory location on cross section are the only variables considered under the planar approach, ignoring the spatial component. To overcome this limitation, this study applies a 3D sight distance estimation method, where the sight distance reduction caused by installing barriers is evaluated, contemplating their shape and position in a detailed fully 3D model. The procedure facilitates incorporating mass standardized constructive elements into the highway model. This method consists of a geoprocessing model on a geographic information system (GIS), where the impact of the terrain, the roadway itself, and the road furniture on sight distance is broached. The results evidenced that the ASD outcomes were different under either approach. In addition, the ASD fell below the required stopping sight distance (SSD) of the standards under either approach. A potential application of this method is the analysis of the overall safety effects and the subsequent evaluation of crash modification factors associated to this safety measure.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainTRA2015-63579-RUnspecifiedUniversidad Politécnica de MadridNuevas tecnologías geoespaciales para estudios de seguridad vial

More information

Item ID: 51101
DC Identifier: http://oa.upm.es/51101/
OAI Identifier: oai:oa.upm.es:51101
Deposited by: Memoria Investigacion
Deposited on: 29 May 2018 10:12
Last Modified: 21 Nov 2018 10:57
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