Visibility Concept In Road Lighting
Author(s)
M. Zalesińska
Abstract
A major purpose of road lighting is to increase the visibility for drivers and other
roadway users. The visibility of a target depends on observer age and visual
characteristics, observer duration, size of target, luminance of the target,
luminance of the background, contrast polarity, exposure time, magnitude of the
disability glare, and adaptation. A visibility formula was described by Adrian in
1989 and applied with Visibility Levels in North America as a quality criterion.
According to procedures described in ANSI/IESNA RP-8-00: American
National Standard Practice for Roadway Lighting the visibility of the target can
be calculated when the target luminance, background luminance and veiling
luminance in calculation methods are given. In European countries this criterion
is still investigated as a new concept.
Keywords: road lighting, visibility level, small target visibility, road lighting
standards.
1 Introduction
Road lighting has significant impact on road traffic comfort and safety. All
participants of the traffic, vehicle drivers, cyclists and pedestrians alike, should
benefit from vision conditions that facilitate the completion of visual tasks. The
entire road along with its background should be well visible at all times. Cyclists
and pedestrians alike should see all obstacles in their way and should be able to
correctly identify the intentions of other traffic participants. The visual reliability
of drivers should be suitably high to allow them to spot, quickly enough,
pedestrians, cyclists and any obstacles present in their traffic lane, as well as road
signs and information boards in its immediate background, in order to reduce the
likelihood of dangerous situations or traffic accidents. Even though the attempts
to identify direct relation between quantitative and quality parameters of road
Keywords
road lighting, visibility level, small target visibility, road lighting
standards
Related Book
Other papers in this volume
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