Circle radii look tidy in a franchise agreement and messy on a Kowloon map. Pedestrian flows bend around MTR exits, footbridges, and mall atriums. When we draw catchments for territory analytics, we start from walking time and known competitor doors, then reconcile against the legal exclusivity clause.
A useful test: stand at the candidate door at lunch and note which existing unit a worker would pass first. If the answer is “ours,” the new site is not expansion — it is redistribution.
Document the buffer in metres and in named landmarks. “200 metres from Exit B” survives staff turnover better than a silent GIS layer nobody opens.