Does this sentence make sense, and does it mean that you will reach a place earlier than someone else? Or would you have to say "ahead of you" or the aforementioned "earlier than you"?
I will be there before you.
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Sign up to join this communitybefore you makes sense and is completely idiomatic, probably more idiomatic than "I'll be there earlier than you". One of the meanings of before is "at an earlier time", and this is an example of using the word in that sense.
In fact, "I'll be in Scotland before you" is part of the lyrics of a famous song. (It's often written and sung as afore ye, which is archaic, but the words and meaning are essentially the same.)
I will get there before you
I will get there ahead of you
I will get there first
all mean
I will get there earlier than you
and are interchangeable without loss of meaning.
“I will be there before you will be there.”
You are referring to an earlier part in the sentence.