SCHEDULE 13Signs only for use in temporary situations

PART 10Amber and blue light beacons

1

An amber or blue light beacon conveys the warning that special care is to be taken.

2

The beacon must comply with the requirements of paragraphs 3 to 5.

3

The peak intensity of light emitted by the lens or lenses of each beacon must be—

a

if the period between individual flashes does not exceed ¼ of a second, not less than 100 candela on the principal axis of the relevant lens;

b

if the period between individual flashes exceeds ¼ of a second, not less than 2000 candela on the principal axis; or

c

if the period between the cessation of a double flash and the start of the succeeding double flash exceeds ¼ of a second, not less than 1000 candela on the principal axis.

4

Each lens must be of such a shape and size that the perimeter of its area projected horizontally onto a vertical plane is capable of lying wholly inside a square having sides of 200 mm in length and wholly outside a square having sides of 100 mm in length.

5

The rate of flashing must not be less than 55 nor more than 150 individual or double flashes per minute.

6

General Directions 17 and 19 of the Schedule 13 General Directions apply to an amber light beacon.

7

General Directions 18 and 19 of the Schedule 13 General Directions apply to a blue light beacon.