Just an hour after the Mountain Road closed, police say they're already dealing with someone who ignored the signs.
The route shut at 9.30am this morning while Department of Infrastructure workers set up the one-way system for TT.
But officers say they've had a report of a cyclist riding on the closed road.
On Twitter, they're reminding people even cyclists have to obey road closed signs, and point out ignoring them is not safe.
The road will reopen at 4.30pm.
On way to deal with pedal cyclist riding on closed mountain road. I'm a cyclist and support riders but this is not safe. pic.twitter.com/A8zxidOnLo
— TweetbeatIOM (@TweetbeatIOM) May 26, 2017
New Dominos branch looking for workers
Part of TT course to close for this afternoon
Road in Union Mills closed this morning
Make sure we can see you in the dark, says bus service
Chief Minister says details on cost-savings to come in April
DoI says it would protect bus services during strike
Peel bids farewell to lifeboat of over 30 years
Fire & Rescue Service deals with 11 incidents in one day