However, this result conceals differences between modes of travel: the routes followed on trips made by bicycle, bus and car (whether singly or in combination with other modes) were all longer on average than the modelled routes, whereas those followed on walking trips were actually 0.2 km (13%) shorter (95% CI 0.1 to 0.2 km), indicating that participants used cut throughs and other paths not present in the route networks used for analysis