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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.
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A11 Roudham Heath to Attleborough Improvements - Traffic Impact Study
A11 Roudham Heath to Attleborough Dualling
A11 Roudham Heath - Attleborough Improvements
Executive Summary
The A11 Roudham Heath to Attleborough Improvements scheme opened on the 19th March 2003. The road is a part of the core National Route linking London, Cambridge and the northern part of East Anglia. This section is one of the remaining single carriageway sections on this strategic route. The improvements included adding a second carriageway, building a new dual carriageway and various other improvements. This scheme, together with two other improvement schemes, will complete the dualling of the A11 between the M11 and Norwich Southern Bypass (A47). The other two schemes, the A11 Attleborough Bypass Improvement and the A11 Fiveways to Thetford Improvement, are scheduled to begin construction in 2005 and finish in late 2007.
The principle objectives of the scheme are to:
- Reduce the accident rate on the road, which is currently at twice the national average;
- Improve the substandard horizontal and vertical alignments; and
- Improve the unreliable journey times that currently exist due to the regular platooning of vehicles behind slow moving vehicles.
Figures 0.1 and 0.2 below show the traffic volumes 'before' and 'after' scheme opening.
Figure 0.1 (450KB PDF)
Figure 0.2 (270KB PDF)
Figure 0.1 - 'Before' & 'After' 5-day averages - HA & County sites
Figure 0.2 - 'Before' & 'After' 5-day averages - County sites on minor roads
This Traffic Impact Study (TIS) Report summarises the main traffic effects of this scheme which were as follows:
- Daily traffic flows on the new improved section rose from around 22,400 vehicles per day (vpd), before opening, to 25,700 vpd after opening. An increase of 3,300 vpd, indicating a number of vehicles being drawn in from other areas.
- There are Journey Time savings of up to seven minutes for movements along this new improved route. This represents a significant time saving over the 15km Journey Time route, representing an average speed increase of 42kph, from 55kph to 97kph. Therefore the improvements have been successful in decreasing Journey Times along the route, and making the journey times more reliable.
- There is also an increase in traffic on some of the minor roads either side of the new improved section, reflecting new junction arrangements to access the improved route.
