Lighting Arrangement

Two Way Traffic Roads: 

There are four basic types of lighting arrangements that are recognized as being suitable for these types of roads.

1.                    Single Side

§    This type of arrangement, in which all luminaries are located on one side of the road, is used only when the width of the road is equal to, or less than, the mounting height of the luminaries.

§   The luminance of the road surface at the side opposite the luminaries.

2.                    Staggered

§   This type of arrangement in which the luminaries are Located on either side of the road in a staggered, or zigzag, arrangement is used mainly when the width of the road is between 1 to 1.5 times the mounting height of the luminaries.

§   Very careful attention should be paid to the uniformity of the luminary on the road surface-alternate bright and dark patches can produce an unpleasant effect.

3.                    Opposite

 This type of arrangement, with the luminaries located opposite one another, is used mainly when the width of the road is greater than 1.5 times the mounting height of the luminaries.

4.                    Span wire

     §     This  type  of  arrangement, with  the   luminaries suspended along that axis of the road, is normally only used for narrow roads that have buildings on either side.

     §     The luminaries being suspended from cable strings between the building Combinations of these four basic arrangements are, of course, also used There are also special purpose low-mounted arrangements for the purpose of providing visual guidance.

     §     The road surface luminance is then very low because of shadows cast passing vehicles, and depreciation due to dirt collecting on the luminaries.