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Where does the 800 meter catchment area for a fixed rail line originally come from?

JNA

Cyburbian Plus
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In delivering public transport accessibility goals and targets, service planning makes assumptions about walking distance to access public transport.
Guidelines often use one quarter mile or 400 meters, or multiples such as one-half mile or 800 meters, as key distances in network and service planning.
The empirical origin of these commonly used “rules of thumb” is unclear, although Neilson and Fowler (1972) found that 70 percent of elderly bus users in a low-density Florida
retirement area lived with one-eighth mile of the bus route, and bus usage at a total walking distance of one-eighth mile was three times greater than the usage at a distance of one-quarter mile.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.366.6694&rep=rep1&type=pdf
 
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