Every self-respecting British transport modeller knows the six-year rule and their clients worry about its implications for timescales and budget: demand data in transport models should not be older than six years to stand up to WebTAG scrutiny. To me, it is surprising that this rule is contested so rarely. For starters, why six years, and not five, or eight? How hard is the rule – or is it mere guidance? And what about the waste in not using older data? So here’s my challenge: as a...
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