The law does not say, Thou shalt not speed.
It says that if you are caught speeding then police officer who witnessed it can decide whether or not to stop you. He then must decide whether or not to fine you. Then if the judge or prosecutor decides it is in the best interest of the community to lower that fine in order to save the tax payer the expense of a trial he has the authority to do that and whatever that final agreed upon amount is, you can pay right then or they will usually give you as much as an additional 30 days to pay it; it just depends on how broke you tell the judge you are at the moment. And the important point is that as long as you pay it, the authorities simply don't care about how fast you drive. If they did, it wouldn't be up to the discretion of the officer, the prosecutor or the judge as to whether or not you were properly punished for the "crime". And note that this whole time the one who pays the fine has remained completely within the law of the land.
The point here is that speeding laws are arbitrary and they have more to do with revenue for the city or state than anything else. The proof of this is the fact that it is almost universally true that you simply will not be fined or probably even pulled over for doing anything less than 10 mph over the posted speed limit. They don't do it because it cost the city more money to process the payment of your fine than the amount of the fine can cover. As long as you aren't going crazy weaving all over the road and being dangerous, it's not worth their time or effort to stop you. In some cases, city planners actually take this into consideration when deciding what the posted speed limit should be. They intentionally set it lower than they actually expect for the traffic to go! And once again, this can happen because the law states that the fine is triggered at the discretion of the police officer not at the breaking of the speed limit.
So all that to say this: I detect no hint of guilt or of wrong doing at all when I travel at speeds less than 10 mph over the posted speed limit as long as I am not acting as if the road belongs to me and that I'm the only one who exists on the street. If your conscience is clear then there is no sin in your doing the same. However, if you violate your conscience you sin, whether the act itself is actually wrong or not so be careful to examine yourself and then do as God would have you do.
