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Legend (TxDOT_National_Highway_Symbols)

TxDOT National Highway (1)
BI BI
BS BS
BU BU
CR CR
CS CS
FD FD
FM FM
IH IH
PA PA
PR PR
RM RM
SH SH
SL SL
SS SS
TL TL
UA UA
UP UP
US US
<all other values> <all other values>