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My first guess would be the road itself having something up with it that aligns with your car's design.
The quick and dirty math says that at 60mph your wheel is doing 12 revolutions per second, or 6 per half second.
So if it was something with your hub, rotors, or pads, it should be more machine gun pace as they complete 1 revolution rather than pulse every half second.
Have you tried this same road at significantly lower or higher speeds?
Or have you maintained the exact same speed with cruise control on this same road but over a long stretch to see if the pulsating changes?
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