Mollinsburn Interchange connects the M73 with the A80 and provides access to the local side road network serving Mollinsburn, Condorrat, Kirkintilloch and the western parts of Cumbernauld.
The two-lane northbound carriageway of the M73 merges with the two lanes of the A80 eastbound carriageway approximately 400m prior to the exit for the local road network. A similar arrangement exists on the westbound A80 carriageway between the entry from the above locations and the M73 southbound diverge.
The layout of this junction and the associated slip roads is significantly below the standard required for the current volume of traffic. In addition, the high percentage of weaving traffic over a relatively short section of road also raises concerns over safety, particularly during off peak periods when traffic speeds are higher.
At Mollinsburn, a new high capacity interchange has been designed to permit the free flow of traffic between the M73 and the eastern section of the M80 and provides for all movements to and from Mollinsburn, Westfield and Condorrat, as well as connecting the de-trunked section of the existing A80 to the west. Environmental constraints in this area have strongly influenced the design of the interchange with the mainline passing to the south of the Mollins Roman Fort site and to the north of the Mollinsburn Road Cuttings SSSI.
The M73 link roads serving the eastern section of the M80 will be realigned as they are substandard. The new northbound M73 link road connecting to the eastbound M80 carriageway will partly follow the line of the existing A80 carriageway before bridging over the new M80 and merging with it by means of a lane gain. The realigned southbound M73 link road will diverge from the westbound M80 carriageway by means of a lane drop and will again partly follow the line of the existing A80 carriageway.
Connection between the M73 and the western section of the M80 is by means of a new overbridge, west facing slip roads only, and connecting link roads. The two junctions connecting the slip roads to the side road network will be signalised. The side road network in the area has been significantly altered to allow all movements between the motorway network and local destinations to be achieved. This includes the realignment of Mollins Road and other sections of the local road network.
The existing Mollins overbridge will be demolished due to the substandard vertical clearance with a new crossing of the realigned M73 link roads located to the west, thereby providing an improved horizontal alignment of the new side road. Any redundant sections of the existing local road network in this area will be removed and landscaped.
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