Policymakers must, of course, stick to the evidence and base their decisions around proper, peer-reviewed research. Until, that is, the evidence starts to tell you what you don’t want to hear. The Mayor of London’s office appears to have been caught red-handed in refusing to publish a study it had itself commissioned into the behaviour of residents following the imposition of low traffic neighbourhoods (LTNs). The study, by the University of Westminster, found that the presence of an LTN resulted in more people cycling, but it did not decrease car use and had no discernible effect on walking. It reached this conclusion by quizzing more than 4,500 London residents, some of whom lived in LTNs and some who did not.

Shouldn’t we be allowed to know this? It seems that City Hall would rather we

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