School Project... Need some feedback!

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Hey guys, Just wanted some input on a subject i have to do for school. Well, firstly, i need to know if there are any decent car enthusiast trade websites that allow searches of people looking to trade used cars? I am doing a concept website for car enthusiasts to trade cars (between different brands). I personally found that a problem when i was considering a trade. But anyway, i was thinking that this conceptual website would work closely with car forums so it would be easily acknowledged and