Motorists and other travellers have been advised to allow for delays in their journeys on one of the busiest bank holiday weekends of the year.
Bus Éireann expects to carry some 200,000 passengers on long-distance and provincial bus services throughout the country over the October bank holiday weekend.
Bus services will operate to normal weekday timetables, with additional buses on all major routes.
Around 250,000 passengers are expected to travel through Dublin airport. More than 1,800 flights will arrive and depart during the October bank holiday weekend, including 120 charter flights to sun destinations that have been added to the normal schedule.
Dublin airport said passenger figures are up 7 per cent on the same period last year.
"Passengers are advised to arrive at Dublin airport 90 minutes before their flight departure time in order to comply with check-in and security regulations," said a spokeswoman.
Around 14 million people have passed through Dublin airport so far this year.