If you have ever been hit in the rear by a vehicle because the driver was (asleep, playing with a cellrnphone, or whatever, it doesn't take too much to make you ill at ease with traffic closing in on you. I speak from experience (1951, 1992, and 1997).rnA low frequency flasher and driver inserted right after the brake light switch should get the attention of the person closing in on your rear-end even with text messaging, cell phones, and loud music.
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