What is Transport Performance?
+Travel by Bus, Train & Walking Modes
+Transport performance is a statistic developed by The European Commission that allows measurment and comparison of how efficiently people move through transport networks.
+In the example below, transport performance is visualised for a single location in Cardiff.
+Using this location as the journey origin, travel times to the surrounding neighbourhood within 45 minutes can be calculated. The proximal population that can be reached is summed. This population would be reachable from the journey origin if travel at 15 km/h in a straight line were possible. This assumption is coherent with the European Commission’s assumption of average travel speed by public transport.
+The accessible population for the same journey duration is also calculated. This is the number of people reachable from the journey origin by public transport and walking modes.
+To calculate the transport performance statistic, the ratio of accessible to proximal population is taken.
+\[ +P(^tmax,^dmax) = \frac{Accessible Pop}{Proximal Pop} \times 100 +\]
+\(P =\) Transport Performance
+\(^tmax =\) Maximum travel duration (45 minutes).
+\(^dmax =\) Maximum travel distance (11.25 km).
+\(Accessible Pop =\) Total population reached from any journey origin point, by public transport.
+\(Proximal Pop =\) Total nearby population, as the crow flies and at a constant speed of 15 km/h.
The transport performance statistic is calculated for every 200 m2 cell in the area. As the journey departure time is known to affect the available services, varying the departure time results in differing transport performance. In order to produce a less volatile statistic, the transport performance for every cell is calculated at 1 minute interval departure times between 08:00 and 09:00 on a single day. The chosen date in this example is Wednesday 22nd November 2023, a day that is representative of average public transport service in the public transport schedules.
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