A simple way of removing three roundabouts on the A4 and replacing them with GSJ's. The main J12 roundabout has gone and all M4-A4 movements are freeflow. Immediately either side of J12 are two smaller roundabouts which have also gone. Because of the close proximity to J12 not all movements are available at these smaller GSJ's. The GSJ on the far left corner already has slips to the westbound carriageway and I've added a bridge to provide access to the eastbound carriageway which was lost by removing the roundabout to the west of J12. To the east of J12 a limited movement GSJ is provided to serve McDonalds and a retail park. The missing movements can be catered for by performing a U-turn at the roundabout on the right edge of the map.
Originally uploaded to Coppermine on Mar 11, 2008 by Truvelo