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What is the speed limit in Unites states,Italy, and many other developed countries?

I'm doubt one of my friend argue with me there is a top speed of 150 KMPH even in express highway in united states,then i'm wondering how an owner of a super bikes and super cars,like Hayabusa,ninja,cbr,lamborghini,ferrari,pagani can run at their top speed,please clarify me,if these vehicles exceeds to top speed any problem?

Cars cannot run at their top speed in the USA.
Speed limits vary from state to state in the USA, but the fastest you will fine is 75 mph, which equals about 120 KMPH.

On most US roads, if the police catch you going 150 KMPH, you will be fined a huge amount and possibly thrown in jail for wreckless driving.

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