Design Aspects - Road Lighting: Fundamentals, Technology and Application - page 180

kerb
side

kerb
side

2h

1h

0

80

80

60

1h

80

60

40

60

40

20

40

20

2h 20

10

10

10

5

5

3h 5

2

4h

R1
sym

R3
sym

R3
asym

5h

1h 0 1h 2h 1h 0 1h 2h

1h 0 1h 2h

Fig. 13.2 Isoluminance diagrams. Left and middle : theoretical symmetrical luminaire, the lumi-
nous intensity of which is constant in all directions, for a diffuse and glossy type of road surface
respectively (R1 and R3). Right : a tightly glare-controlled, asymmetrical luminaire on road surface
R3

In pedestrian areas closed to all motorized traffic, road safety for motorized traffic
ceases to be a design consideration and full scope can be given to providing effective
security and amenity lighting. The lighting in both residential and pedestrian areas
should, and can if properly designed, increase their attractiveness to local residents
and visitors alike. This challenge can be met by architects, town planners and lighting
engineers working together, each drawing on the knowledge and experience of the
other.

13.1 Lighting Arrangements

There are five basic lighting arrangements. As shown in Fig. 13.3 , these are: the
single-sided, the staggered, the opposite, and the central (span-wire) and the twin
central. Combinations of these arrangements are, of course, also employed. For a
given road width, the type of arrangement determines to a large extent the required
minimum mounting height of the luminaires, and with that the luminaire spacing.