Let me use an anecdote...
I took a trip to Atlanta, Georgia, last year, using a 6-year-old road map. What the heck does this have to do with anything, and why is this significant, you ask?
Because in the year 2000 (or was it 1999?) The state of Georgia renumbered their interstate exits to be consistent with their mile markers, rather than their own system.
This made directions invalid for many, many people, and also meant I did not have the correct exit numbers for any of my exit points.
However, I got along just fine. Why? because All the other signs were the same. I knew the exit for Interstate 20 vs. Interstate 75, the other signs still told me the off-ramps for heading to Peachtree street ( a street so long, it is the interdimensional nexus that connects Atlanta to the rest of the multiverse), and in a nutshell, it threw me off a little but didn't harm my trip in the slightest.
Now, the next time I travel to Atlanta, I won't even NEED a roadmap, because the exit numbers are consistent, and tell me how far I still need to travel to get to my correct exit. All my future trips will be even easier to take than they were before.
Damn those Georgians.
