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Table 9 Indicators of indirect barrier effects

From: Disentangling barrier effects of transport infrastructure: synthesising research for the practice of impact assessment

Effect on Indicator Description
Frequency of visits Ratio of changes in number of visits Percentage of interviewees who indicate they changed the number of visits they make to destinations and social contacts or decided not to make some of these trips to avoid a barrier [9, 10, 71, 108]
Suppressed pedestrian trips Number of trips missing in travel behaviour statistics, relative to averages for comparable places. Missing trips can be assumed to be suppressed or that a different mode was chosen [134]
Visited destinations Ratio of changes in destination of trips Percentage of interviewees indicating that they changed the range of destinations they visit [108]
Routing of trips Crossing ratio “[N]umber of pedestrians who cross a road as a proportion of the pedestrian flow, over a given section or at a specific point” [122]. Registration through video observation
Ratio of changed routes Percentage of interviewees indicating that they changed their route planning [59, 71]
Organisation of trips Ratio of changes in timing and organisation of trips Percentage of interviewees indicating that they changed their trip timing and organisation [68]
Mode of transport Modal share Number of trips that, due to barriers, are made with another than the preferred mode, typically foot and bicycle [29, 47, 71]