The Steam Packet Company is advising people to leave extra time to make it to the boat in Belfast this weekend.
The Belfast Marathon is taking place from 9am on Sunday, May 4 with thousands of people expected to be taking part or spectating.
On its website, the Steam Packet says roads may be busier than usual and there could be diversions in place depending on where people are driving from.
It says you should leave yourself extra time to reach the port.
King to visit Island today
Douglas is preparing to welcome King Charles this morning.
Warning over parking suspensions for King's visit
Police are warning anyone parking where they shouldn't before the King's visit tomorrow may find their car towed away.
Peel residents outraged over toxic powder spread near young gull
Residents in Peel say they've contacted police after toxic powder was spread along a street to discourage seagulls.
Commissioners tackle beach rubbish after online criticism
Ramsey commissioners say they've listened to public criticisms about litter and bins at one of the town's beaches.
This year's bookings will be honoured, says closing venue
A hospitality business in Douglas says it'll shut down at the end of this year.
Noel tackles charity car wash for Autism Initiatives
Noel Edmonds has been showing off his car-washing chops, to raise money for a good cause.
TT legend's bike could fetch up to £55k at auction
A motorbike ridden by TT legend Mick Grant on the Mountain course could fetch up to £55,000 at auction later this month.
Southern road temporarily closed this week
A road in the south of the Island is temporarily closed this week.
