Music fans, day-trippers and holiday makers as well as regular commuters and residents can expect lengthy delays around Swansea this weekend.
BBC Radio 1 Biggest Weekend in Singleton Park will host 60,000 people to watch and listen to Ed Sheeran, Florence And The Machine, Taylor Swift and Sam Smith and there are local road closures over Saturday and Sunday.
The Hay book festival will also create congestion in South East Wales between Abergavenny and Brecon and motorists should allow more time to use the main road.