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Basically it activates the dynamic brake lights and keeps them on... (shitty explanation)

I almost never use mine except in bad, bad dust storms or when twatwaffles are flying up on me.

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The rear fog lights are on the boot lid light clusters besides reversing lights.

For Austin traffic, I could use them for extra brake lights. So many bad drivers. For my Ram, the hitch has a nice bed step insert with LED lights. Any car or truck that hits it will take out there entire front end from grill to engine block.