The car knows what the speed limit is at all times. It knows this because it knows what the speed limit isn't, by subtracting what it is, from what it isn't, or what it isn't, from what it is, whichever is greater, it obtains a difference, or deviation. The guidance sub-system uses deviations to generate corrective commands to drive the car from a speed where it is, to a speed where it isn't, and arriving at a velocity where it wasn't, it now is. Consequently, the speed where it is, is now the speed that it wasn't, and it follows that the speed where it was, is now the speed that it isn't. In the event that the velocity it is at is not the velocity that it wasn't, the vehicle has developed a variation. The variation being the difference between what the speed limit is, and what it wasn't. If variation is considered to be a significant factor, it too, may be corrected by the GEA. However, the vehicle must also know where it was. The vehicle guidance computance scenario works as follows: Because a variation has modified some of the information the vehicle has obtained, it is not sure just what the speed limit is, however it is sure what it isn't, within reason, and it knows what it was. It now subtracts what it should be, from what it wasn't, or vice versa. By differentiating this from the algebraic sum of what it shouldn't be, and what it was. It is able to obtain a deviation, and a variation, which is called "five over.”