Wyndcliff Quarry
As you approach the crag from the south / M4, the A466 is signed as closed for about 0.5miles before the normal parking area for access Wyndcliff Quarry, there seems to be some relaying of the road surface but if you dont mind throwing a tiny bit of caution to the wind you should have no problem making it to the car park.
One our our group members tried to make it to the crag via an (unnecessary) alternative route and ended up with a flat type on a pothole.