Captain A. F. Dickson's paper entitled ‘Recommended Routes for Ships in Congested Waters’ (Journal, 17, 217) suggests the introduction of a principle which I advocated in two previous papers, the second of which was presented at the Conferenza Intemazionale Sulla Disciplina dell ’uso del Radar, in Genoa, May 1957. Captain Dickson writes in his article:

It is therefore suggested that the measures to be taken should involve the application of one simple basic rule, that in all cases ships should keep to the starboard side of any channel and that traffic rounding a headland should be separated so that ships proceeding in opposite directions will have a port-to-port passing. In addition, wherever possible the different streams of traffic should be separated by a lane which would be a virtual no-man's-land between ships sailing in opposite directions. The lane might well be shown in colour and British Admiralty experience seems to indicate that purple is a good colour for chart usage, so the lane might be known as the “purple lane”.

In my works it was stated ‘Coastal radar navigation constitutes a very valuable means of making feasible an ordering of the natural traffic streams by regulating them according to the requirements of each area, following experience.