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.
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