Good point.
After looking at the network attributes, it does have oneway restriction evaluators.
It was created with ArcMap and now I am exclusively working in Pro.
I looked at the roads ONEWAY field and it only has "T" as oneway and "B" for both ways.
The Roads Against evaluator is referencing letters that don't exist in the ONEWAY field.
Roads Along
restricted = False
Select Case UCase([ONEWAY])
Case "N", "TF", "T": restricted = True
End Select
Roads Against
restricted = False
Select Case UCase([ONEWAY])
Case "N", "FT", "F": restricted = True
End Select