Blue arrow = google one way direction.
red arrow = street line digitizing direction.
If blue arrow = red arrow are same direction. One way value is 'F'
If blue arrow <> red arrow are NOT same direction, opposite direction, One way value is 'T'
This yellow street line, because of one way direction is opposite to digitizing direction,
There fore one way value is T
Most of city street are two-way, so the one way value is B
LA county will not provide you any one way information. You have to do youself. One street by one street. Time consuming.