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Add a string of LEDs under the wing. It will show when you're on the highway, to help prevent getting rear ended by texters and day dreamers. but will be hidden when driving slow speeds. You won't have to drill any holes or do any permanent damage.
I just looked in my C2S and it appears to have room under there since LEDs are so small. Also, you could manually open the wing if you did ever need extra brake lights (being tailgated in traffic) or an inspection in New Jersey for instance.