It passes through Upper Catshill and meets the M5 at junction 4 (along with the A491 road) near Lydiate Ash. From here to Edgbaston, the road is mostly dual carriageway, single-lane sections having been replaced in the first decade of the 21st century (see history section, below). Following completion of the Selly Oak bypass, the A38 deviates from its original route and briefly multiplexes with the A4040 outer Ring Road before forming the new bypass which is controversially named New Fosse Way. (The old route is designated B384 having been briefly B38).