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There is sometimes concern that low traffic neighbourhoods slow emergency vehicles. We test this using London Fire Brigade data (2012-2020) in Waltham Forest, where from 2015 low traffic neighbourhoods have been implemented. We find no evidence that response times were affected inside low traffic neighbourhoods, and some evidence that they improved slightly on boundary roads. However, while the proportion of delays was unchanged, the reasons given for delays initially showed some shift from ‘no specific delay cause identified’ to ‘traffic calming measures’. Our findings indicate that low traffic neighbourhoods do not adversely affect emergency response times, although while LTNs are novel this perception may exist among some crews.