DoI carrying out resurfacing work for up to three weeks
It's hoped major work at Braddan Bridge will be as pain-free as possible for motorists.
A new one-way system is now in place for up to three weeks, with traffic heading out of Douglas being diverted along Saddle Road.
The road will be closed completely at the weekends.
Highways Liaison Officer Andy Kneen explains why the resurfacing work is being carried out:
Manxman repairs expected to exceed £2.5m
The Steam Packet's flagship has been out of action since July
Treasury Minister: Taxpayer footing Manxman repair bill
Steam Packet has previously said it would be paying
Island's youngest ever MHK says he has 'a lot to prove'
Eighteen-year-old Daniel Davison elected in Glenfaba and Peel
"Clearly I'm a candidate" for chief minister - Chris Thomas
Douglas Central MHK re-elected for the fourth time