|trace=user/Steven/c40_staffordshire_a.osm;user/Steven/c40_staffordshire_b.osm&markers=52.608487,-2.172543 trace=user/Steven/c40_staffordshire_a.osm;user/Steven/c40_staffordshire_b.osm&map=OSMMap&zoom=10&layer=0 Location Map ( trace=user/Steven/c40_staffordshire_a.osm;user/Steven/c40_staffordshire_b.osm_E geo)|
|To:||Pendeford Mill (SJ853024)|
|Distance:||3.1 miles (5 km)|
|Meets:||A41 • C6 • C217 • C260 • C272 • U119|
|Route outline (key)|
Staffordshire County Council's locally classified C40 forms a continuation of the City of Wolverhampton Council's U119, essentially forming a link between the Wolverhampton commuter village of Bilbrook, and the A449 (and then onto the M54 at junction 2) in the one direction, and the A41 towards the M54 at junction 3 and Telford in the other direction.
The route starts at the local authority boundary at Pendeford Mill, just to the west of Pendeford Business Park. Initially, the road is in a semi-urban environment, with a T-junction with the C272 (which heads off to the nearby village of Coven) following almost immediately, before passing the former Boulton Paul aircraft factory, location of the construction of the Defiant during World War II; then crossing the Shropshire Union Canal before entering the commuter village of Bilbrook, which forms a small conurbation with the larger attached village of Codsall.
The road passes through a fairly unremarkable urban environment before meeting the C6 at a double mini roundabout junction across a bridge over the Wolverhampton - Shrewsbury railway line, also the location of Bilbrook station.
Beyond this junction, the road continues to pass through residential areas (including the unusually named Suckling Green Lane) before meeting the C260 at Histons Hill, where the route has a TOTSO to the left before meeting the C217 after about 100 yards on Oaken Lane. The road now disappears as the junior partner in a multiplex for about 130 yards northwards, before striking back out on its own once more along the rural Holybush Lane, before passing through the hamlet of Oaken as Shop Lane before terminating as a T-junction on the A41.