While I was living in Mexico quite often I would find that the police would give you a speeding fine even though you were not speeding. A lot of the police in Mexico were corrupt and were try to get money out of you even if you are doing nothing wrong. Unfortunately there was not much you can do about this because all the police were the same and if you gave them a small amount of money they would go away and not bother you for the speeding ticket. In other countries where there is less corruption if you are given a speeding ticket and you have not done anything wrong you can hire a traffic ticket attorney who can appeal in court and you may get off your speeding ticket. It really depends on the country you are living in and where you can find a good traffic ticket attorney that has experience with these types of cases.