|Location Map ( geo)|
|Distance:||0.7 miles (1.1 km)|
|Route outline (key)|
Beginning at the Portsbridge Roundabout there's a short bit of dual carriageway, before a junction with the original road through Cosham. Over the railway the road is a reasonably wide S2, but it widens out to D2 on returning to ground level. Almost immediately, there's a roundabout, and then another short bit of D2 before the road ends at Spur Road Roundabout.
The history of this route is debatable. The original A3 through Cosham typically appears on old OS mapping as an A-road along with the newer Northern Road (currently A397 but apparently the A3 from the 1930s at the latest) running parallel.