A new speed limit will be in place on the Douglas to Ramsey Coast Road for this year's TT.
Previously, parts of the route have been derestricted, but a 50mph limit will now be imposed over the festival fortnight.
It's part of this year's road safety campaign, which will see police in unmarked vehicles making sure people are sticking to the limit.
Chief Constable Gary Roberts says those who don't follow the rules will be prosecuted.
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