Andrew Gordon and Tom van Vuren comment on my analysis of the outcome of widening a section of the M25 in relation to the forecast generated by the traffic model (LTT 30 April). They observe that scheme benefits are conventionally calculated by comparing the with-project travel demand and journey times against the without-project case. So, they argue, what matters is what would have happened if the scheme had not been built, which can only be estimated from the model results. From this...
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