With three deaths already on open roads this week, the roads policing unit is issuing an urgent appeal to riders and motorists to take extra care.
They say that means travelling at the right speed for the road conditions and riding within your own ability.
Inspector Terry Stephen says the recent warm weather has probably tempted more riders than normal to go out for a lap.
And he's stressing that roads around the course can still be busy with traffic first thing in the morning.
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Police amnesty to end on 2 February
Planning application to extend TT hospitality tent for new Food and Drink Festival submitted
Currently it must be down no more than 10 days after the Festival of Motorcycling
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Unite head says anonymity means nothing when the line is operated by government
Cannan administration 'at its weakest point at the moment'
Tim Crookall spoke to the media for the first time earlier this week since his reappointment to DOI
