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Assigning approach direction of road lanes

Question asked by geonetadmin on Jun 4, 2014
Original User: ttn0711


I need to assign approach directions (northbound, southbound, etc.) to all turn lanes in my connectivity dataset.  How would I go about doing that?  I've been playing around with this problem for a week and cannot figure out what to do.

Each intersection lane (pink) is connected to two links (IN_LINK and OUT_LINK).  I am ultimately interested in identifying approach directions for turn lanes only, but the through ('THRU') lanes provide IN_LINK and OUT_LINK data that I think I can use to determine the approach directions for turn lanes. 

Does anyone know how I should approach this problem using Python?