Old Kilpatrick Interchange
From Roader's Digest: The SABRE Wiki
|Directional T (adapted)|
|A82, A878, A898|
|Junctions related to the A898|
|Toll Plaza Interchange|
The A898 only serves one purpose, and that is to carry traffic across the Erskine Bridge between the M8 and A82. At the northern end of the bridge, the road splits in two, for east- and westbound traffic on the A82. This large interchange, called Old Kilpatrick or Dalnottar Interchange is further complicated by a link from the A814, which despite its length glories in the number A878. As a result, what should be a fairly basic Directional-T junction becomes quite a mess. The junction effectively has three levels, with the A878 at the lowest level, the A82 in the middle and the A898 at the top.
When the roads were first numbered in 1922, the A82 followed what is now the A814 as far as Dumbarton a few miles further west. In the late 1920s, the new Great Western Road was built and initially numbered as the A876, before later becoming the rerouted A82 in 1935. It was at this time that the short A878 was created to link the old and new routes together at Old Kilpatrick. The junctions at either end would have been simple forked splits, albeit with full access. This status quo would have survived for 40-odd years until the Erskine Bridge was opened in 1971.
The A82 and A898 have full access in all directions. However, true to its origins the A878 is only connected to the A82, it has no access to or from the A898. In addition, city bound traffic cannot move from the A82 to the A878, although providing such a slip would not have been difficult within the junction. All of the sliproads are single lane, with the westbound A82 having two exits, one for the A898 and one for the A878, while the citybound A82 only has one onslip, the A878 and A898 slips merging beforehand. Nevertheless, the bridges and underpasses all appear to be two lanes wide, with the mainline A82 having a central reservation potentially wide enough for at least one additional lane either way.
The only other point of interest is that both of the A82 to A898 slips have a layby on them. I believe that these used to be signed for abnormal loads intending to use the Erskine Bridge, but don't recall the signs more recently.
|Erskine Bridge, Paisley (M898)|