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Better information for your journey
The National Traffic Control Centre collects real-time information on road conditions.
The Project Control Framework
On 1st April 2008 we launched the Project Control Framework. The Framework sets out how we, together with the Department for Transport, manage and deliver major improvement projects.
Traffic news on your desktop
Helpful ways to access the latest traffic information when you need it.
Traffic
Traffic
Figure 1: Do Minimum Traffic Flow - View larger image 
Existing and Predicted Traffic Flows
The traffic flows shown on Figures 1 & 2 are Annual Average Daily Traffic flows in both directions (abbreviated to AADT). Figure 1 shows the predicted daily flows in 2003, 2008, and 2023 on the existing road network assuming no bypass is built. Figure 2 shows the predicted daily flows in 2008 and 2023 assuming a bypass is built.
The existing 2003 flows are based on actual traffic counts. Today's traffic flows are higher than these figures, reflecting traffic growth and local developments completed since 2003.
The 2008 opening year and 2023 design year flows are predicted by the scheme's computer Traffic Model. The 2008 flows take account of the extra traffic generated by ongoing and committed housing and business developments expected by Swindon Borough Council before 2011. The 2023 flows are those predicted in the scheme's design year, 15 years after opening. They additionally include for national traffic growth predictions between 2011 and 2023. Low and high traffic growth predictions are shown.
Junction Capacity Existing
Turnpike Roundabout is congested, especially during the peak hours, with queues of over 1 kilometre in length reported on both northbound and southbound approaches.The scheme would remove about two thirds of the A419 through traffic from the proposed Bypass junction.
Figure 2: Do Something Traffic Flow - View larger image
Junction Capacity Proposed
The junction design has been assessed using nationally accepted computer modelling techniques. Details of the predicted peak traffic movements, junction geometry, and traffic signal installations have been used to avoid significant queues.
The busy peak hours were tested up until the design year of 2023 (15 years after opening), to ensure that road capacity would not be exceeded on any part of the local network.
At the Lady Lane Junction, the 2023 assessment indicated a maximum queue of 8 vehicles on the southbound off slip from the A419. The longest queue predicted in 2023 would be on the Highworth Road approach to the junction, with 21 vehicles queueing in two lanes.
On the Link Road between the two parts of the junction at Lady Lane and Turnpike, the maximum peak hour queue in 2023 would be 18 vehicles queueing in two lanes.
At the Turnpike signalised junction no other 2023 peak hour queue would exceed 10 vehicles in length.
