My cousin was caught driving 120-130 on a 65 in Arizona and was arrested immediately. It was bailable though so he got out...

Just was wandering about the insurance, his company probably is in partnership with an American company is my guess, another question would be whether or not European vehichles meet all the safety requirements that are required in the US. On speeding, I live in the west, speed limits are usually 70 MPH, I have gone by Highway Patrol cars at 95 MPH before without any consequence, I immediately slowed down but apparently they had better things to do than cite me, I use a radar detector and for long trips I install a CB radio and monitor channel 19 which provides vast amounts of information through the truckers chating.

What's a CB radio?

CB
 

CB is short for citizens band, around 26-27 MHZ, a channelized system (40) that all US truckers use to pass information between each other, good for hearing information about road conditions and speed traps, they are not too expensive, around 60-80 dollars for a low end system.

Hello from New York
 

Yes – payment of the fine constitutes a “guilty” plea and will close out your case. If you do receive a ticket, it should have payment information on it (a number to call to figure out your fine, payment address and accepted methods, etc). You should be able to arrange for payment before leaving the U.S. – possibly by credit card via internet or phone (not sure if your card will need a U.S. address).

I’m comfortable driving up to 10mph over the speed limit; above that, just make sure that you’re not the fastest or most aggressive car on the road. If you do get pulled over, simply remember to be nice and polite. The policeman will ask for your driver’s license, car registration, and proof of insurance. He will probably take those items back to his car for several minutes while he checks the documents. If the he questions anything, just explain patiently – your demeanor more than anything else will determine the outcome. As an out-of-town guest, there’s a good chance that you’ll receive a written warning instead of an actual ticket unless you get angry or otherwise have a bad attitude.

In the absence of erratic or reckless driving behavior, you have a very slim chance of being pulled over. Enjoy your trip – it should be an incredible experience!

What you say is right LR, but ...
If you're in California, he/she will be back with your ticket ready to sign, no place for discussions.
Exception, California (and I think other places) were a ticket will be always be given. Warnings will be given only for few cases, eg burnt lights, missing registrations, etc. Warnings in most cases still requires a trip to the DMV or court house to show that the problem has been corrected.
I think the most common advice has been given already - If you plan a long trip on solitary roads where the speed limit is absurdely low, get a good radar detector, learn how to use it and where is legal to.

Couldnt read through all of the posts...but..... I know for fact if you are caught in that state again you will end up in the metal restraints. Next time move to a different address before entering the states and force them to prove it was the same guy. I remember during the "Gumball 3000" in the states a German tagged BMW was pulled over for doing 140+ in a 70mph... officer walked to up the car on the wrong side...collected license..attempted to run it..then jumped in his and drove back off...no citation..no nothing. Of course alot of the others were arrested.