Police are reminding motorists the Mountain Road is always one-way during TT fortnight.
From Ramsey Hairpin to the Creg-ny-Baa vehicles must travel in the direction of the course, 24 hours a day.
Head of road policing Mark Britton says there is continual enforcement of the one-way system, and the dangers of going against the flow are obvious.
Emergency services dealt with a couple of minor incidents on the Mountain Road today (Tuesday) including one accident which required a road closure for a short time.
Isle of Man faces renewed scrutiny ahead of Moneyval inspection
Mobile classroom proposed for UCM horticulture compound
Chance to learn more about career opportunities on Island
Report highlights risks of environmental crime entering financial system