AIR, rail and bus passengers travelling from Ireland to Britain and Northern Ireland will face major delays because of a general strike.
Three million British public sector workers will down tools during a 24-hour "Day of Action", which starts at midnight tonight.
The strike is part of an ongoing row over public sector contribution changes.
There will be no rail or bus services between Dublin and Belfast, while airline passengers planning to use British airports can expect delays at immigration.
Some estimates said there could be delays of up to 12 hours on international flights at London Heathrow and other airports.
Airlines have cancelled some flights in and out of London Heathrow tomorrow as British Prime Minister David Cameron warned the strike will damage the UK economy.
There will be no cross border Dublin-Belfast rail service as all Translink services will be suspended for the day.
A curtailed Dublin-Belfast Enterprise service will operate between Dublin and Dundalk only, with just four trains in each direction.
Iarnrod Eireann said customers who made reservations to travel on Dublin-Belfast services tomorrow have been contacted and offered refunds.
Customers with queries can contact the customer service line on 1850 366 222.