Paragraph 21

A lamp which when illuminated shows a symbol of the size, colour and type shown in the upper portion of Diagram No. 4002 in the Regulations shall be provided on the right hand side of each approach to the crossing along the specified road so located as to be approximately 4 metres before the railway. The lamps shall be directed towards pedestrians approaching the crossing on the right hand side of the specified road. It shall be possible to adjust the directional alignment of the lamps.