Yes.
For me it does reduce fatigue due to wind noise. You will have to experiment for yourself. Try a 6 hour stint w/ plugs in over 70 mph and you'll get my point.
Also, earplugs come in different ratings for noise attenuation, measured in decibels (db). More decibels (-30db) mean more blocked sound. If you're worried about hearing stuff around you, go with a -25db or -28db plug, not a -30db. Further, realize that some earplugs attenuate different frequencies of sound better. For instance, my -30db plugs block my bass exhaust note but I can still hear my brakes hissing. You will have to experiment with plugs to find the right combination of attenuation (quietness?) and frequency pass-thru.
That is all.
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