I learned EZ Passes purchased in the NE only work in the NE. Also EZ Passes or Quick passes purchased in the SE only work in the SE. However, if you buy your transponder in North Carolina, it works both places! Woohoo! We registered our Class C, as well as our SmartCar Toad. Surprisingly, our charges were very low in OH and NY. Havnt figured out why, but not complaining