Police say they've already had to stop people trying to go against the TT one-way system on the Mountain, just hours after it came into force.
The Roads Policing Unit says it had a busy day yesterday dealing with various incidents on the Island's roads.
On Facebook, officers, say they had to stop more than one person trying to ignore signs on the route after it reopened at midday yesterday.
They're asking people to read the signs and ignore sat navs.
Stop putting knives in recycling, says council
Bee Gees to release limited-edition box set
Northern Irish politician criticises Manx visa rules
Elective surgical unit opens at hospital
Piling rig on TT course tonight
10-day bus strike from next weekend
Yellow snow warning issued by forecasters
Ramsey harbour keeper completes 3,000-Mile Atlantic crossing