It's not just that a waved flag may well be hard to see or missed altogether by drivers in high speed machinery but it should also help to ensure the safety of Marshals.
Drivers who may be involved in a very competitive race situation whilst trying to keep an eye on everything else blurring past can miss flags. Especially in windy or bad weather where poor visibility due to rain or spray can obscure a bit of coloured cloth no matter how vigorously it is being waved. These light panels will surely be more easily visible than a figure wearing hi-viz clothing.
They will also prove valuable not just at race meetings but at track days and test sessions. It may also cut down on the number of Marshals needed at some events, and that might be a good or a bad thing depending on your point of view.
What next? Sprint and Hillclimb courses? And what about stage rallies?
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