Welsh Assembly Government publishes road and rail noise maps

At the present time it appears you have to send for the noise map by post. There is a cost. I can't tell straight away which grid number Penyffordd By Pass is on.

Penyffordd By Pass makes more noise than Castle Cement ever did but is ignored by some villagers in favour of bashing Castle over noise levels. The elephant in the room is ignored.

Noise Maps and Monitoring.

Major Noise Source Project Areas

Decibel levels in Wales available at a click (Well South Wales anyway)

Link here