In April 2018 WSP was commissioned to create a bespoke S-Paramics microsimulation traffic model for Leatherhead. The purpose of the model was to test the effect of potential changes to the Leatherhead highway network to meet the aims and objectives.
Data was collected in June and September 2018 to create the baseline traffic model which included:
- Automatic number plate recognition (ANPR) to understand the routes vehicles took within the study area using Origin Destination
- Automatic traffic counts (ATCs) on the roads and car park entrances to capture vehicle flow, occupancy, vehicle speed and types of vehicle
- Manual classified junction counts (MCC) to capture the number of vehicles turning and queuing at specific junctions
- Car park interviews and surveys to establish journey purpose and occupancy levels
The modelled network included the gyratory system and the surrounding roads. Although our focus is on the Town Centre, it was clear that we couldn’t aim to reduce congestion without considering the impact of changes on the wider network.