Eisteddfod officials have appealed to motorists not to drive through Betws-y-Coed to reach the site in Llanrwst.
Motorists travelling from north west Wales are advised to use the A55 and then turn for Llanrwst near Llandudno Junction (19), or take the A470 through Blaenau Ffestiniog and Dolwyddelan.
During the last few days there have been delays on the A5 in both directions as a result of the heavy traffic through Betws-y-Coed.
North Wales Police say it will take less time for people to reach Llanrwst from the west is they want to avoid Betws-y-Coed.
Betsan Moses, Chief Executive of the Eisteddfod said, “We realise what people are doing - they're using the usual route to reach Llanrwst, but this is not a typical week. We are appealing to motorists not to travel through Betws-y-Coed and to follow the main routes from Llandudno and Blaenau Ffestiniog.
“The traffic is flowing smoothly in and out of the car parks. However it seems that many travelling through Betws-y-Coed are causing delays with regards to reaching some of the car parks. We can assure visitors that it's easy to park in any of our car parks with the convenient park and ride shuttle bus system."
North Wales Police added, "We are strongly advising motorist to follow our appeal not to travel through Betws-y-Coed. The quickest way of reaching the Eisteddfod in Llanrwst is to follow the signs on the A55 or the A470 and avoiding the centre of Betws-y-Coed."