What is it about?

This study modeled fixed and swiveling headlight beams to study the combined effect of these vehicle lighting technologies and the highway geometric design on sight distance in nighttime. To this end, the headlight beam is modeled in 3D as a pyramid originated at the position of the headlights. This is used to check whether targets ahead are lit up by the headligths, and therefore visible to the driver at night. Fixed and swiveling headlamps are assumed.

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Why is it important?

Sight distance is a fundamental factor in the geometric design of highways. Highways are three-dimensional facilities and must be designed and examined as such. In addition, sight distance analysis must consider driving under all circumstances, including nighttime. Whereas daytime has been extensively studied, sight distance in nighttime has received less attention despite the higher accident rates.


This study will serve as a basis to link vehicle lighting technologies and safety performance at night.

Dr. César De Santos-Berbel
Universidad Politecnica de Madrid

Read the Original

This page is a summary of: Effect of vehicle swiveling headlamps and highway geometric design on nighttime sight distance, Mathematics and Computers in Simulation, September 2019, Elsevier,
DOI: 10.1016/j.matcom.2019.08.012.
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