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Linear referencing - how does Arc decide which end of a line to start with?

Question asked by keithaddison on Jul 26, 2019
Latest reply on Jul 29, 2019 by tkowal

Using ArcMap 10.3.1 - I applied linear referencing to a big tangled looping around on itself many times mass of separate polylines (I didn't combine any of them, all had a unique identifier) I used the two fields option as the measure source with a FROM and TO attribute field.  What I haven't been able to figure out is how the program determined which end of the polyline to use as the starting point (the FROM field) and which to use as the end point (the TO field).   How does Arc determine this? 

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