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Service Area polygon appears to fill in between the roads for areas it should not reach

Question asked by maire61 on Jan 31, 2018
Latest reply on Feb 1, 2018 by maire61

In ArcMap 10.5.1 using Network Analyst, I have created a service area polygon of 1000m along a road network, with a trim of 50m. In the image you will see where the road is linked around, the inside is filled in (red circles). However I believe there should be a hole in this area as it is outside of the trim and not reachable within the parameters.

Process: After adding the Network Dataset I used the Network Analyst toolbar to create a new service area. I added Facilities, which was one single central point. Within Service Area layer properties I set the Impedance to 1000m, in the direction away from the facility. I chose to Generate Polygons - Detailed with a 50m trim. I also chose to generate a line.

What am I doing wrong here?