Quote:
Originally Posted by lio45
I'm not a bird, I'm a driver. Any metric that considers that I'm a bird is flawed. Period.
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The 150km (or whatever) radius is just a measure of population density within a given area/region around a point. It is what it is! 150km is not a far distance! In the US I believe they use 100 miles (161km) as a market service radius. A good example is the oft quoted 100 mile diet
A road between two points might be two lanes and curvy, so 100km may take 1.5 hours. Or maybe it is straight and freeway class with light traffic, so in that 1.5 hours you can go 160km. Or may that freeway has heavy traffic for most of the day and in that 1.5 hours you can only make it 100km. Travel time has too many variables (congestion/construction/speed limits/inclement weather) to be used as a metric - distance makes more sense so they use that. Places within that 150km radius, some educated persons have deemed, have influence on each other and can be visited and serviced fairly easily via the roads and such that are in place - and of course the higher the population density the more travel options/routes are in place (secondary highways/freeway/ferry/train/bridge)
For example Victoria has 4 ferry services off Island, 1 to the Lower mainland and 3 to Washington State (Anacortes, Port Angeles and downtown Seattle). Ferries are really just in place of bridges that would be too costly to build. BC ferries even used to managed under the Ministry of Highways, before it became quasi-crown.