Why not include tail lights in daytime running lights?

Now that car makers are adding "daytime running lights", why don't they have them illuminate the tail-lights as an added safety feature?

I'll ask a few brands but the likely answer is that DRLs boost visibility in potential frontal and side-on crash situations. Brake lights, particularly since the introduction of high-mounted stop lights, already do the job in cutting the potential for rear-end crashes.

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