Grove Park Interchange
| Grove Park Interchange | |||
| Location Map ( geo) | |||
_-_Geograph_-_3340787.jpg) | |||
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| Location | |||
| St Julians, Newport | |||
| County | |||
| Monmouthshire | |||
| Highway Authority | |||
| Welsh Government | |||
| Junction Type | |||
| Fork | |||
| Roads Joined | |||
| M4, A4042 | |||
| Junctions related to the A4042 | |||
Grove Park Interchange is junction 25A of the M4 in Newport, Monmouthshire. It came into being as a result of the Brynglas Tunnels and Malpas Road Relief scheme. As a result of that scheme, the primary A4042 was rerouted from Malpas Road onto a new alignment, partially following the old Monmouthshire Railway eastern valleys line. Where this route crosses the eastern mouth of the Brynglas Tunnels, a new roundabout was built (known as Grove Park Roundabout, along with sliproads connecting directly to the existing J25, which was then made limited-access. The intention was to prevent traffic from J25 travelling westbound through the tunnels, instead forcing them into a detour either to the north or south to gain access at J26 on the other side of Brynglas Hill.
Routes
| Route | To | Notes |
| Cardiff / Caerdydd | access only from M4 | |
| London, Chepstow / Cas-gwent | ||
| (M4 (W) / (Gn)), Cwmbran | ||
| Newport, Cardiff | ||
| Caerleon (B4596) | spur to M4 J25 |
