The A4148 is the Walsall Ring Road. The route was first classified as the B4456 in the late 1920s and was then gradually renumbered A4148 in the 1960s, with the western side the final section to gain Class I status. There are now no classified roads within the loop.
For the purposes of this description we start at the southwest corner of the A4148 at a set of traffic lights, where the A461 is met and the A4148 TOTSOs. Heading clockwise the road heads north along the residential Bescot Road. It soon goes over a railway line and then meets the A4038 Darlaston Road at traffic lights just before going over the Walsall Canal. We continue between a hospital and light industry before the road becomes dual just before meeting the A454 at traffic lights. We TOTSO right.
We remain D2 as we head east. The road soon crosses the canal again before skirting a retail park. The A34 leaves soon afterwards, then the B4210 (original A34) at the next set of lights. That road is one-way northbound here (with contraflow bus lane); we meet the southbound carriageway soon afterwards by the leather museum. We then cross the Birmingham to Cannock railway line at a bridge which has a plaque on it commemorating the completion of the ring road in 2009; in fact the road had already existed for some time but it was in that year that the northern section of the road gained its current alignment: there was a one-way system between the A454 and the leather museum.
Shortly afterwards we meet a signalised crossroads (a roundabout until recently) with the A461, suggesting we're halfway round the loop. On the far side the road narrows to become S2 and passes Walsall Arboretum. The road name is now Broadway North; it'll remain something similar for most of the rest of the road. There's a shallow but continuous bend round to the right and by the next roundabout, for an unclassified road, we're heading due south. We continue as S4 after meeting the B4151, after which the A34 is met again at a double roundabout.
The road name now becomes simply Broadway although it's back to S2 now. We alternate between green areas and housing, after which the road decides it's had enough of roundabouts and so when we meet the A4031 it's at traffic lights again. We continue westwards on Broadway West and pass to the north of a retail park which also contains Walsall FC's stadium. The road duals again in time to cross the railway line and we meet a set of traffic lights soon afterwards, which is back where we started. The road ahead is the A461 which soon meets the M6 at J9. Meanwhile the A4148 TOTSOs right to go round the loop again.