M4 corridor bridge, serving Chepstow, being renumbered the M48, although the area is still generally considered as falling within the M4 corridor. Since the start of the 21st Century there has been evidence of more investment west of Cardiff, such as: M4 corridor The M4 corridor is an area in the United Kingdom adjacent to the M4 motorway, which runs from London to South Wales. It is a major high-technology hub. Important cities and towns linked by the M4 include (from east to west) London, Slough, Bracknell, Maidenhead, Reading, Newbury, Swindon, Bath, Bristol, Newport, Cardiff, and Swansea. The area is also served
M4 cycleway down underneath the M4, above the Duck Creek and the A'Becketts Creek. The path runs through the middle of the M4 cement columns which forms a scenic reminder, albeit suburban, of the functionality of the path. The path continues to follow the cement colonnade of the M4. On either side of the path are access points from Harris Park. Near the junction of Parramatta Road, Church Street, and Woodville Road, where the M$ passes over the junction, the cycleway provides various spur options: the north to Parramatta central business district via High, Wigram, or Railway Streets; and to the south