Officers have focussed on the issue over the last two weeks
Sixteen arrests have been made in relation to drink or drug driving during the Manx Grand Prix and Classic TT period.
The Island's police say the roads have been busier during the racing fortnight.
The Isle of Man Constabulary says it's an issue officers have been focussing on throughout.
Inspector Elliot Butler says there'll be further analysis to determine the split between locals and visitors:
Overnight sailings cancelled due to adverse weather
7:45pm Manxman crossing and its return have been called off
Rapist who 'terrorised' his victim told his sentence was 'entirely justified'
Fayle jailed for 18 years and 9 months
Complaints process for health system changed
Patients told to direct concerns to service used
Discovery of oiled birds 'makes a mockery of our biosphere status'
Manx Wild Bird Aid say it's a recurring problem in Peel
Charges now in place for those sending parcels to the EU
Changes have been introduced by EU rather than the IOMPO