Police say they've issued 178 speeding tickets so far this TT.
In an update, officers say four people have been arrested after being clocked doing more than twice the limit.
The Roads Policing Unit alone says it's made 25 arrests so far during the festival period.
And 22 people have been given roadside breath tests, with 11 drug wipes carried out.
50-acre remote sanctuary up for sale
Northern tip's re-use area to open again next month
Mountain Road closed for TT sign removal
Decision on Summerland campaigners' appeal this week
More works on Old Castletown Road this week
Airport says flights may be affected by morning's fog
Could the Grandstand be getting a new entrance plaza?
Caine to defend seat in general election