Local authority Cardiff

Region: Wales
Count points: 164
Time period: 2000 to 2018
Source: Road traffic statistics

1.86 billion vehicle miles were travelled on roads in Cardiff in 2018.

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Data disclaimer

Traffic figures at the regional and national level are robust, and are reported as National Statistics. However, DfT’s traffic estimates for individual road links and small areas are less robust, as they are not always based on up-to-date counts made at these locations. Where other more up-to-date sources of traffic data are available (e.g. from local highways authorities), this may provide a more accurate estimate of traffic at these locations.

It is the responsibility of the user to decide which data are most appropriate for their purpose, and if DfT road link level traffic estimates are used, to make a note of the limitations in any published material.

Quality flags in data downloads

DfT’s road link level traffic estimates are calculated using a variety of methods, with some methods likely to produce more accurate estimates than others.

The data tables available to download here contain a column - estimation_method – showing the method used to estimate traffic for each location and year. Figures having an estimation method of “Counted” are likely to be more accurate than those marked as “Estimated”, and the latter should be used with caution.

Data Description Records Download
Count points Count points in Cardiff details. 164 JSON | CSV
Traffic Traffic is calculated by multiplying AADF by the corresponding length of road and by the number of days in the given year. 26 JSON | CSV
Average annual daily flow Number of vehicles that travel past the count point (in both directions) on an average day of the year. 1,905 JSON | CSV
Average annual daily flow by direction Number of vehicles that travel past the count point on an average day of the year, by direction of travel. 3,730 JSON | CSV
Raw counts Vehicle counts recorded at this count point. 25,596 JSON | CSV