Great Barr Interchange
|Great Barr Interchange|
The Great Barr Interchange is junction 7 of the M6, intersecting with the A34 between Walsall and Birmingham. Whilst at first glance it appears to be a 3-level stacked roundabout, the west facing sliproads are attached to the inside of the roundabout instead, probably because of the M5 nearby along with the lack of space between the westbound M6 and the northern end of the northbound exit sliproad from the A34. As a result, the interchange works slightly differently to a roundabout. Another unusual feature that is very rarely seen with 2-level roundabout interchanges, 3-level stacked roundabout interchanges or roundabouts in general, is the absence of stop lines and other give way lines on the roundabout with the exception of the southern end of the A34 southbound exit sliproad. Combined with the absence of traffic lights on the roundabout, this feature in effect makes this interchange almost fully free flowing with many movements catered for by a circular sequence of lane gain from and lane drop to the sliproads, all around the roundabout. Unfortunately the very short weaving spaces on the eastern side of the roundabout severely reduce the safety and effectiveness of this interchange.
|The North West & Stafford, The South West & Worcester (M5)|
|London (M1), Coventry|
|Birmingham, Perry Barr, Newtown, University of Central England, Container Base|