Motorists do not need to take any action if they see the signs light up between 7am and 7:30am.
The electronic red flag system is being tested this morning around the Snaefell Mountain Course.
The displays, which are used alongside the existing marshal-operated red flag system are located at flag points and will illuminate simultaneously during the scheduled test window.
Motorists do not need to take any action if they see the signs light up between now and 7:30am.
Outgoing chief minister keen to 'fulfil' election commitments
Cannan replaced by Chris Thomas in job top
Chris Thomas elected Chief Minister
He won the vote 16-6 in Keys
Larne sailings at risk of disruption or cancellation
Warning for passengers ahead of forecast adverse weather
How your MHK voted in the chief minister vote
Chris Thomas elected to replace Alfred Cannan