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.
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