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Dear all, I am a master student, currently working on my final dissertation of applying space syntax to traffic analysis. I need to draw an axial map of whole Hong Kong territory. I know that Axial map of London consisting 17321 lines is successfully done by somebody. According to the statements made by Hillier and Hanson in 1984, in the book named “The Social Logic of Space”, the processing of making an axial map should begin with the longest straight line, then the second longest, and so on until the all convex spaces are covered and all axial lines should intersect with each other without repetition. How could the creator of London axial map ensure this principle when he drew the map? I know axial line is drawn based on visibility, you can go where you can see. But in my work, I need to analyze the traffic movement in the city's street network. Is that justified to draw the lines based on reachablity? Somewhere in the city, based on visibility, the axial lines should intersect, but based on reachability they should not. For example, please see the attached figure1, the axial line 1 should intersect with axial line 2 and 3 from the visibility point of view, but should not because street 1 is not directly intersected with street 2 and 3 (Figure 2), in other world car driving on line 1 can not directly shift to line 2 and 3. Which principle should I use, visibility or reachability when I draw the axial map? Any advice will be highly appreciated!