Paragraph 7 I1

A barrier must have on both front and rear faces alternate red and white bands each approximately 600 millimetres wide (measured horizontally across the face of the barrier) and to the full depth of the barrier measured vertically on the full face of the barrier when horizontal. A strip of retroreflecting material not less than 50 millimetres deep, in a colour matching that of the bands must be attached along the full width of each band.