The last set of simulations (see Wool Traffic Simulation for more background information) only used existing measurements to generate the model.
The Department for Transport produces forecasts for the estimated number of vehicles over the next 25 years. This data is available from the following location:
The following table shows the Forecasts of road traffic in England and the increase from the estimated 2015 level.
More infomation on the different Scenarios can be found in the Road Traffic Forecasts 2015
The following video shows the simulation at the first time the cross goes down (~8:15am) with the extra vehicles using the Department for Transport forecast statistics for Scenario 1.
The simulation above was created using flow data from:
The Video shows the queue goes beyond the Dorset Green roundabout.