Heh.
I'm assuming everyone knows the 'rule' for numbering -
2-digit odd numbers are North/South routes, 2-digit evens are East-West.
3-digit starting with a odd number are Spurs, 3-digit evens are bypasses/perimiters.
Does this I-99 follow THAT numbering scheme?

But yeah, there are errors in a few places - "I-220" is used more than once - In Alabama, and Louisiana, I think.

(And then, on top of it all, there's just confusion about many of the signs, espically the Ped Zone/ Ped Crossing and the School Zone / School Crossing. In Georgia, here, they've gone out of their way to screw those up, which while it dosn't really affect anything, it does if you happen to get a ticket for some reason. Wrong size/shape/legend signs can get you out of traffic violations in a heartbeat.)

Me.