Driver glare exposure with different vehicle frontlighting systems

Alcón Gil, Patricia and Santos Berbel, César de and Castro, Maria (2021). Driver glare exposure with different vehicle frontlighting systems. "Journal of Safety Research", v. 76 ; pp. 228-237. ISSN 00224375.


Title: Driver glare exposure with different vehicle frontlighting systems
  • Alcón Gil, Patricia
  • Santos Berbel, César de
  • Castro, Maria
Item Type: Article
Título de Revista/Publicación: Journal of Safety Research
Date: February 2021
ISSN: 00224375
Volume: 76
Faculty: E.T.S. Arquitectura (UPM)
Department: Estructuras y Física de Edificación
Creative Commons Licenses: None

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Introduction: Highway safety performance at night has received less attention in research than daytime, despite the higher accident rates occurring under night-time conditions. This study presents a procedure to assess the potential hazard for drivers created by headlight glare and its interaction with the geometric design of highways. Method: The proposed procedure consists of a line-of-sight analysis performed by a geoprocessing model in geographic information systems to determine whether the rays of light that connect headlights and oncoming drivers are obstructed by either the roadway or its roadsides. Then, the procedure checks whether the non-obstructed rays of light are enclosed by a given headlight beam. Different hypotheses were set concerning the headlight beam features, including the horizontal spread angle and whether the headlights are fixed or swiveling. A highway section was selected to test and validate the procedure proposed. A 3D recreation of the highway and its environment derived from a LiDAR point cloud was used for this purpose. Results: The findings disclose how glare is produced on tangents, horizontal curves, transitions between them and sequences of curves. The effect of visual obstructions conveniently placed is also discussed. Conclusions: A greater glare incidence is produced as the horizontal headlights spread angle increases. Swiveling headlights increase glare on highways left curves and reduce it on right curves. Practical Applications: The procedure and conclusions of this study can contribute to develop more effective glare avoidance technologies as well as identify and assess glare-prone sections. The glare evaluation assists in evaluating glare countermeasures such as deciding whether to place a vegetation barrier and where.

More information

Item ID: 66642
DC Identifier:
OAI Identifier:
DOI: 10.1016/j.jsr.2020.12.018
Official URL:
Deposited by: Dr. César de Santos Berbel
Deposited on: 07 Apr 2021 12:57
Last Modified: 07 Apr 2021 12:57
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