This is an old revision of the document!
This page details the analysis of the Traffic travelling through Wool using the data provided by WoolRATH.
The Traffic survey Data was collected by volunteers on two separate dates (6th September 2016, 9th September 2016).
The following table shows the results from the traffic survey.
Thank you to all the volunteers who capturing the numbers.
There are lots of ways to process the data to generate a model. For example we could take the single highest traffic count (Station Garage West, at 4pm) or the maximum average total flow for a direction.
Although the traffic queuing up past Station Garage towards the roundabout is an important simulation to do, the principle idea of the simulation is to show the traffic build up through the village as this has the most impact on the village in the form of rubbish, air and noise pollution. So to generate this model, the highest count of vehicles heading east will to be used. Looking at the table above, this would be 06/09/16 - Winfrith Roundabout at 8am.
The following table shows the results that will be used to create the model:
To generate the model, we also need the level crossing down times. This data is available from the Open Rail Data (Note1).
Tue Sep 6 08:14:58: Train 1W96, From DR62, To 5268 - Closing Tue Sep 6 08:19:40: Train 1W51, From 5261, To 5267 - Opening Tue Sep 6 08:39:53: Train 1W52, From DR62, To 5268 - Closing Tue Sep 6 08:45:04: Train 2W09, From 5261, To 5267 - Opening
The following video shows the initial simulation using the data from above (the Crossing down times and WoolRATH data).
NOTE: The Video of the simulation has been started at ~ 8:15 to see the first crossing down. The Simulation is also running faster than real time (benny hill mode).
This simulation is based on current counts taken by people. No additional information has been used to create the simulation other than the crossing down times.
The previous simulation shows the current situation in Wool. The next stage is to show how the extra 1000 homes will affect the traffic flows.
The “Potential Traffic Impacts of Development in the Wool Area” (Referred to as PTI see Note2) provides the TRICS (Trip Rate Information Computer System) estimated trip rate for the extra 1000 homes where the Vehicles are leaving at 8am. This is given as 346 over the hour.
The PTI uses a split of 55:45 split for West and East bound traffic. For this simulation the East/West split measured at Station Garage at 8am was used. It has also been assumed that the 1000 homes will not generate any extra HGV traffic.
|Direction||Cars||% Total Cars||Est Cars Leaving new development|
From the data above, the extra 1000 homes will generate 176 cars between 8am and 9am heading east (towards Wareham). The other 170 vehicles have been ignored because they are heading away from the crossing.
This following video shows the simulation output.
The Video shows the Queue forming on the first crossing down (about 8:15am).
The Videos show that without the extra homes, the queue goes back as far at the Central Convenience Stores. Adding the extra vehicles caused by the 1000 homes makes the queue go past the current Purbeck Gate entrance and up towards the Winfrith Roundabout. This distance is about 600m or 0.4 miles.
The original “Potential Traffic Impacts of Development in the Wool Area” (Note2) assessment predicted a maximum queue length of 82m (514m-432m, page 17, table 8.1). The simulations above show that the queue length from the extra 1000 homes is closer to 600m.
The simulation does not take into account traffic coming from Lulworth into Wool past the Spar Shop. In previous simulations adding this data shows that the traffic junction by the Station will become congested and a major traffic bottleneck.