Digital red flag tests will be carried out today around the TT course ahead of the Manx Grand Prix.
Motorists are being told to ignore the tests.
The flags are red or black, and let riders and marshals know when a race has been stopped.
The Manx Grand Prix is scheduled to run from Sunday to August 26.
One hour MEDS phone line outage this evening
Festival of Remembrance at the Villa next month
Planning fireworks? Let the airport know
FOI reveals nearly 90,000 untaxed vehicles
Ramsey Remembrance service to be marked by maroon rockets
MEDS phone line to be down temporarily
Committee to examine link between poverty and poor academic performance
Police advice for trick-or-treaters to stay safe