“I declare today Caesar’s Cipher Day! For 24 hours, every numeric symbol’s value shall be incremented by 1, modulus 10. 1 is now 2, 2 is now 3, … 9 is now 0, and 0 is now 1. Thus, 1 + 1 = 5. Anyone who finds it confusing will be directed to our personal responsibility instructor who will didactically remind you that it is your fault for not understanding!”
Also consider this angle when designing reroutes (ditto to the MTA itself): would Steve Jobs rake you over the coals for your complex, unintuitive, consumer-unfriendly proposal if you presented it to him?