Racing gets under way on Saturday

The racing will start on Saturday, much to the relief of tourism industry, but some sections of the mountain course will be closed to spectators.

There are special areas for fans at the Gooseneck, the Bungalow, Keppel Gate, and Creg-ny-Baa.

Clerk of the course Neil Hanson said he would not hesitate to stop the event if people ignored the rules.

"If people go into designated prohibited areas... then if they don't move after a warning we will stop the practice or stop the race if necessary," said Mr Hanson.

"If it happens before we have started it wouldn't start until they have moved and let no-one doubt that is what we will do."

A ban on people entering countryside paths was among the restrictions put in place by the Isle of Man government after the foot-and-mouth outbreak in the UK.