There will be more than a hundred parades on throughout the country, and the AA's Road Planner on its website will be listing diversions.
The N52 from Birr to Dundalk will be particularly affectes by road closures, due to parades at Ardee, Kells, Tullamore and Kilcormack.
And Cork-Dublin traffic will be stopped at Durrow at 2pm. The motorway bypassing Abbeyleix and Durrow is not yet complete.
