You are lucky it wasn't a couple of miles per hour faster. Then it is a mandatory court case in Michigan.
You have a couple of options...
1. Pay the ticket and chalk it up to experience. Swallow your lumps and go on with life. You may think you are a safe driver even at that speed but you have very little chance to react to another careless driver. In Michigan , we have enough of those already. Have you ever thought of the time difference you would actually make on your arrival time by slowing down to 70-75mph? (10 miles per hour) = 7.5 minutes per hour.
2. Write on the ticket that you will appear for a hearing. Make sure you get to the court house EARLY so that you can talk to the district attorney and the officer who pulled you over. Try to work out a compromise to lower the speed variance on the ticket if that wasn't already done for you and you were actually going over 90 mph.My gut tells me the officer already gave you a brake by lowering it to 84 mph to prevent it from being a mandatory court case. If the 84 mph was the real speed violation and not higher,perhaps you can plead to another offence that does not carry points reported to Ontario like impeding traffic. The fine you will pay will not be reduced at all but you might avoid the points or have the number of points reduced.
That should be your defence... I know I was wrong.. I took off a day from work and came back to the States to take care of this. I would like to avoid a stupid decision on my part to have additional ramifications on my insurance for years to come. Be sincere.
DO NOT pretend this will go away. Michigan and Ontario share traffic data and ignoring it will cause a bench warrant for your arrest in Michigan and loss of your driving priveledges in Ontario. The warrant part won't follow you to Ontario but if you get pulled over in another US state, they will run your license for warrants and "could" send you back to Michigan in cuffs to settle a much higher fine and a mandatory court case. Call your OPP and ask if points transfer to Ontario... I am pretty sure they do. They do in reverse. (SEE POST BELOW... they do transfer)
If all this is too much of a hassle for you then just pay the ticket and do better next time. The roads over here are not as well maintained and black ice exists at many times of the day. You have much less survivability for an object going 90 mph out of control. Take yourself out is bad enough but people usually involve others in their poor judgement and cause them to crash too. Then watch what happens to your rates.
http://www.mto.gov.on.ca/english/dandv/driver/demerit.htm
Demerit Points for Out-of-Province Convictions
Drivers convicted of a driving related offence in the State of New York, the State of Michigan or any Canadian province or territory, will have home jurisdictional penalties such as demerit points and/or suspensions applied to their Ontario driver record as if the offence occurred in Ontario.
Examples of out-of-province convictions where Ontario demerit points and /or suspensions will be applied include:
Traffic Criminal
Speeding
Fail to obey stop sign
Fail to obey signal light
Fail to stop for school bus
Racing
Fail to remain or return to the scene of a collision
Careless driving
Motor manslaughter
Criminal negligence
Dangerous driving
Failure to remain at scene of a collision
Impaired Driving
Driving while disqualified or prohibited