what's the difference between "up front", "up ahead" and "upfront" ?
When I want to refer to a car in front of my car on the road, which one is correct:

I see a car up front.
I see a car up ahead.
I see a car upfront

Question

what's the difference between "up front", "up ahead" and "upfront" ?
When I want to refer to a car in front of my car on the road, which one is correct:

I see a car up front.
I see a car up ahead.
I see a car upfront

Answer

"Upfront" and "up front" are a little different.  "Upfront" is used as an adjective directly before a noun. Either can be used as you have as an adjective in the predicate, but "up front" is better here.

See http://grammarist.com/usage/upfront-up-front/

Answer

"Ahead" is a direction, and "front" is a location. But in the sentences you used them they are both correct.

Answer

All these phrases are correct, it is really up to you and how you want to speak. I personally would say, "I see a car up front" but some people say, "I see a car up ahead of me" or "I see a car upfront" which are all correct.

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