Standards and Recommendations - Road Lighting: Fundamentals, Technology and Application - page 106

Table 9.9 Recommended (maintained) lighting values as specified in the American Standard RP-8
for some different classes of roadway. (ANSI/IES 2014 )
Road

Lighting criterion

L av (cd/m 2 ) Pedestrian activity L av / Lmin L max /L min L v /L av

Freeway class A 0.6 3.5 6.0 0.3

Major road High 1.2 3.0 5.0 0.3

Medium 0.9 3.0 5.0 0.3

Low 0.6 3.5 6.0 0.3

Local road High 0.6 6.0 10.0 0.4

Medium 0.5 6.0 10.0 0.4

Low 0.3 6.0 10.0 0.4

9.3.2 Lighting for Intersections

As can be seen from Table 9.9 , the American Standard differentiates between high,
medium and low pedestrian presence. For intersections, the Standard adds specific
average horizontal illuminance requirements. As an example: for intersections in
major roads (34 to 18 lx), in collector roads (24 to 12 lx) and in local roads (18 to
8 lx). The value in the ranges is dependent on the type of pedestrian-conflict area
(high, medium and low, respectively).

9.3.3 Lighting for Pedestrian Areas and Bikeways

The Standard addresses the lighting needs of pedestrian and bikeway areas by divid-
ing them into three categories according to the degree of pedestrian conflict: high,
medium and low. The type of conflict relates here especially to the vehicle/pedestrian
interaction. The Standard states that because the visual environment may often be
cluttered and detection of pedestrians is required, both the horizontal and the ver-
tical illuminance should fulfill minimum requirements. Vertical illuminance is here
defined at a height of 1.5 m in both directions parallel to the main pedestrian flow.
Table 9.10 shows the recommended values for some examples of areas.
The Standard explicitly states that the recommended values do not consider areas
where there is increased crime and vandalism.
Glare restriction for pedestrian and bikeway areas is not given in a specific, quanti-
tative way. It is merely stated that glare must be restricted by paying careful attention
to luminaire mounting heights, the light output of the lamps, and their photometric
distribution.