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A5 Nesscliffe Bypass
2. Data Collected
- The Traffic Impact Study (TIS) for the A5 Nesscliffe bypass included the following surveys:
- 'Before' Surveys
- 8 Shropshire County council site locations;
- Automatic Traffic Count data (ATC) from 2 Highways Agency permanent count site locations; and
- Journey time surveys (JTS) on the A5 from A5/B4397 junction to the A5 / road to Ensdon House junction.
- 'After' Surveys
- The 'After' surveys mirror the 'Before' surveys with the addition of an extra ATC site on the new bypass and an additional journey time route along the new road, which was undertaken on 14th May 2003.
- 'Before' Surveys
- The details of the 'Before' and 'After' surveys are described below.
AUTOMATIC TRAFFIC COUNTS (ATC)
- The scheme itself was due to open on 27th March 2003, and thus, the count equipment was connected on 1st March and scheduled to continue for eight weeks to incorporate the scheme opening day and the weeks after opening. One lane in each direction was opened early on the 10th March and therefore only one full week of data was available pre-opening.
- Due to Shropshire County Council's part in managing and funding the collection of the 'Before' and 'After' traffic data on county roads, and data from permanent Highways Agency count sites, we have been able to ensure a comprehensive evaluation of any local traffic routeing changes in the area.
- The eight County sites used were as follows:
- B4396 at Knockin Heath;
- B4397 at Baschurch;
- A528 at Cockshutt;
- A528 Broadoak;
- Unclassified road at Huffley;
- B5067 Gravelhill;
- B4380 at Montford Bridge (south of river);
- Unclassified road at Forton;
- Traffic data has been obtained from three Highways Agency permanent count sites on trunk roads, namely;
- Old A5 at Wolfshead (north of Nesscliffe);
- New A5 bypass, north of Nesscliffe; and
- A5 at Montford Bridge (south of scheme).
All count sites used are illustrated in Figure 2.1 below:
Figure 2.1 - Location of Traffic Count Sites
JOURNEY TIME SURVEYS
Journey Time (JT) Surveys were also undertaken on the A5. The 'Before' JT route covered the section of A5, from Ensdon in the south to a point north of the bypass. The survey route, comprising five timing points, is depicted in Figure 2.2 below. A further JT survey was undertaken after scheme opening, with the same start and finish point, but using the new bypass.
Figure 2.2 - Journey Time Survey Route along the old A5
- 'Before' journey time surveys previously undertaken on Tuesday 14th May 2002 (well before any delays during construction were observed) were used for comparison with surveys carried out post scheme opening. Survey periods used were the morning (08:00-09:00) and evening (17:00-18:00) peaks as well as an inter-peak period (10:00-15:00).
