The comparison of vehicle headlamps

Jakub Motl,Kateřina Bucsuházy,Filip Suchomel,Albert Bradáč

doi:10.1088/1757-899x/1203/3/032014

Jakub Motl, Kateřina Bucsuházy + Show 2 more

Open Access

https://doi.org/10.1088/1757-899x/1203/3/032014

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Abstract

The aim of this article is the comparison of vehicle headlamps in terms of pedestrians' visibility at nighttime conditions. The study was designed to gain results, which could serve as a basis for the pedestrian-vehicle accident analysis in terms of visibility during night drive. For this study were used comparable vehicles (same vehicle type and model year) with different headlamps type. Three different headlamps (halogen, xenon and LED headlamps) were used for the analysis. Experiments were carried out under similar conditions (straight road, nighttime, no disturbing factors). During a series of static tests, the vehicle approached at predefined distances to the figurant - pedestrian standing on the right side of the roadway. For the luminance analysis were used Luminance Distribution Analyser LumiDISP - software for analysing the luminance conditions based on evaluation of image data from digital photos.

Highlights

The vehicle-pedestrian crashes often lead to severe injuries especially due to pedestrian vulnerability
The driver perception of the pedestrian is influenced by several factors, among other pedestrian clothing, location and driver age
The contrast values for low-beam headlamps are illustrated by the following graphs for both types of pedestrian clothing

Summary

Introduction

The vehicle-pedestrian crashes often lead to severe injuries especially due to pedestrian vulnerability. To significantly increase pedestrian safety, pedestrians must become aware of the driver's limitation and become more visible. Drivers often do not recognize their visual limitations and are not prepared to react to unexpected risk such as pedestrians or obstacles [1]. Drivers abilities to recognize pedestrians on the open road were measured in several studies [1,2,3]. Pedestrian perception distance decrease when the situation is unexpected, pedestrian wear dark clothes on a dark road and is located on the left side of the approaching vehicle, vehicle lights are set to low-beam mode, the driver is older or impaired in some way, glare is present, a pedestrian is not moving and/or visibility is limited [4,5,6]. The amount of glare depends on beam aim, intensity, spread and wavelength [4]

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