New Hampshire 1-2-3

Randy Weiss continues his string of new state introductions this time bringing New Hampshire's first mathematically significant roadsign! The sign is a bit less than exciting, but it is still valid. It is curious that the sign was modified at some point to remove two positions, but what would they have been. It would be rare for a sign to start with 0. Also, why in the world do the numbers go from right to left. This sign may in fact hold great mysteries.



This may be the simplest math possible in Road Sign Math.

$$1 + 2 = 3$$

This sign is found along I-89 southbound where I-89 ends and joins I-93.