The twilight envelope: a user-centered approach to describing roadway illumination at night.

Abstract:

:Visual recognition functions, such as acuity and contrast sensitivity, deteriorate rapidly over the declining luminances found during civil twilight. Thus civil twilight, a critical part of the transition between daylight and darkness, represents lighting conditions that may be useful to describe artificial illumination. Automotive headlamps project a three-dimensional beam that ranges from illumination levels comparable to daylight at the vehicle to the dark limit of civil twilight (3.3 1x) at some distance ahead. This twilight envelope is characterized as a distance beyond which foveal visual functions are severely impaired, and thus it provides a general, functional description of the useful extent of the headlamp beam. This user-centered approach to describing illumination is useful for characterizing visibility when driving at night or in other artificially lit environments. This paper discusses the twilight envelope approach and its application to intervehicle variations in headlamp systems. Actual or potential applications of this research include user-centered description of artificial illumination and driver/pedestrian safety education.

journal_name

Hum Factors

journal_title

Human factors

authors

Andre J,Owens DA

doi

10.1518/001872001775870331

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

620-30

issue

4

eissn

0018-7208

issn

1547-8181

journal_volume

43

pub_type

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