Hi Guys,
https://www.waze.com/en-GB/livemap?zoom=17&lat=51.60348&lon=-2.99716
The eastbound carrigeway of the M4 is closed until 6am on the 22/05/2017 for maintenance on the tunnels. The is effectively a closure from J26 to J25. This closure began Saturday 20/05/17 @ 20:00
http://www.walesonline.co.uk/news/wales-news/one-brynglas-tunnels-closed-weekend-13038469
I hope the links are sufficient.
Thanks
Mark