S39º 0A.BCD
A - Number of times the letter T appears on the top line
B - Number of letters in the word before SMART
C - Number of letters in the black/white stuff
D - The two numbers beside 'The Forgotten World Highway' added together
E174º 0E.FGH
E - Number of letters in the word before WAVE
F - Number of Js on the sign
G - Number of MAUIs on the sign
H - Number of yellow signs
Checksum: A+B+C+D+E+F+G+H=29