My son has just driven along the A4212 Bala-Trawsfynnedd road today and reports that workers are installing signs for a new 30 limit from the hairpin at the end of LLyn Celyn to the junction with the B4391 Bleanau Road. This is a wide, open section of road that is quite safe at the current 60 limit - so it looks like this is going to be ruined for those who like the road.
I cannot find anything on Google at the moment as to why this limit is being imposed or if it is permanent. As there are repeater signs going in I suspect this is permanent.