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.
Film extras needed for new Island-shot movie!
Could you kickstart your film-star career this TT?
Government video shows plans for four-foot harbour wall
The government has released a new video showing what Ramsey's harbour would look like if flood prevention plans are approved.
Commissioners say “pick up your pooch’s poop!”
Port St Mary commissioners have issued a plea for dog walkers to show some local pride and clean up after their pets.
Historic Manx one-pound notes up for auction
Two unique banknotes could fetch as much as 150 times their face value this weekend.
Is the Island ready for 100,000 people?
How will the Island's schools and health system cope with 100,000 people?
Set your alarms! Young Farmers Concert tickets on sale this weekend
Tickets to one of the Isle of Man's most-anticipated theatre events will go on sale this weekend.
Treasury Minister says a tax threshold rise could cost £2.5m
Treasury Minister Chris Thomas says more work would be done to calculate how much raising income tax allowances would cost the government.
Snow shuts the Mountain Road
The Mountain Road has been closed today due to heavy snow and dangerous driving conditions.
