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He stopped. Not too far ahead of him, on the other side of the blacktop highway, was a woodchuck. A damned fat one. Sleek and sassy, too. Instead of scurrying off into the high grass, it was coming on ahead. There was a fallen birch sticking its top half out onto the shoulder of the road, and Barbie was betting the woodchuck would scurry under there and wait for the big bad Two-Legs to go by.

Question 1: In this case, what's the meaning of 'come on ahead'? (what's the meaning of 'ahead' here?)

Question 2: Here, come on = move faster? ahead = forward? If not, could you tell me their meanings here?Question: Here, is 'come on' relevant with speed ( FASTER )? ( come on == move FASTER? )

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Questions
He stopped. Not too far ahead of him, on the other side of the blacktop highway, was a woodchuck. A damned fat one. Sleek and sassy, too. Instead of scurrying off into the high grass, it was coming on ahead. There was a fallen birch sticking its top half out onto the shoulder of the road, and Barbie was betting the woodchuck would scurry under there and wait for the big bad Two-Legs to go by.

Question 1: In this case, what's the meaning of 'come on ahead'? (what's the meaning of 'ahead' here?)

Question 2: Here, come on = move faster? ahead = forward? If not, could you tell me their meanings here?Question: Here, is 'come on' relevant with speed ( FASTER )? ( come on == move FASTER? )

Answer

Well this has had 42 views and no answers!  I am English and don't know the phrase in that context!  I t sounds like Southern United States English!  From the context I guess it means that the woodchuck was coming towards 'two legs' rather than scurrying away.
In everyday English the phrase "Come ahead!" is used as an invitation for someone to move forward.
example: If I am walking down a narrow street, and someone is walking towards me,  I can step to one side and say "Its okay, come ahead" or better "It's okay, come on!" this invites them forward.  So ahead will means forward.
If the tone of voice is more emphatic, "Come on!" can be used to suggest that I hurry  up.  However in everyday English if someone was 'coming on' to me, it would usually means that they were flirting with me!
Hope that's not too confusing!

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ramblin guys: A ramblin man is a man who can't settle down, wanders from town to town,doing what he pleases.

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The second answer is: to go faster or to make something go faster.
Forward: in the direction that one is facing or travelling; towards the front.
"he started up the engine and the car moved forward"
synonyms:	ahead, forwards, onwards, onward, on, further
"the traffic moved slowly forward".

I hope this will help!

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Hello, 
In English Synonyms of "come ahead": arrive ahead, be ahead, come before.