Road traffic volumes in four urban areas : Measured with travel survey data: NTS 2018/19 and 2022/23

The urban growth agreements are fundamental instruments for achieving the zero-growth objective for passenger car transport in the largest city areas. The primary measures of goal achievements are city indices (Byindeks) derived from car traffic counters on roads in the urban areas. The secondary indicators are vehicle kilometers estimated from travel survey data, of which this report presents results based on the national travel surveys, RVU 2018/19 and 2022/23. The RVU estimates are compared with Byindeks and official statistics on total car mileages. The different data sources for car traffic are not directly comparable. Furthermore, both RVU and Byindeks render quite large error margins. Yet, the results indicate that car traffic has developed more towards zero-growth in the largest cities compared to the surrounding municipalities. Also, due to traffic counter coverages, some city indices seem to apply better to car driving related to the largest city municipality, rather than the total area of the zero-growth objective.