Paul Withrington uses the word flow when he means volume (Letters LTT 13 Nov). The flow of passengers travelling between stops depends on the numbers boarding at previous stops less those alighting, per unit of time, not on the distance between the stops.
By analogy, the DfT calculates annual average daily flows (AADFs) to measure traffic flow on the highway network – that’s the average number of vehicles per year divided by 365 at count points at specified junctions on the...
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