Police are pleading with motorists to stick to the one-way system over the TT fortnight.
Work is being carried out today to turn the Mountain Road one-way between Barrule Park in Ramsey and the Creg-ny-Baa - it'll close from 9.30am until 4.30pm.
It's something that happens every year - and something that still catches out both visitors and locals:
Detective Inspector Mark Newey says the problem is exacerbated by SAT NAV systems telling people they can drive onto the course.
Evening Heysham services also cancelled
Sailings tonight and early tomorrow morning are the latest to be cancelled this weekend.
Weather lays waste to more sailings
Morning and afternoon sailings today are the latest to be cancelled.
More sailings cancelled as storm tightens grip
Sailings tonight and early tomorrow are the latest to be cancelled as Storm Dennis hits the Island.
Bad weather sees sailings called off
Sailings this morning and this afternoon have been cancelled due to the expected arrival of Storm Dennis.
Warnings in force as Storm Dennis looms
Weather warnings are entering their second day with Storm Dennis expected to hit today.
Suggestions invited over speed enforcement
The constabulary is inviting suggestions from residents for where they think should be monitored for potential speeding.
Action to affect extra-curricular sessions, schools warn
Schools are warning industrial action by teachers will affect extra-curricular activities later this month.
Chief Minister to be quizzed on successes and failures
What are the successes and failures of the Chief Ministers administration?
