I've been trying to perform a Service Area analysis using three break values (450, 900 and 1800) with both detailed and simple polygon generation in a model. The analysis produces the expected result using those break points when creating the detailed polygons, but the simple polygons don't. The process adds in other break points in addition to those requested.
I've copy/pasted the Detailed process and only changed the Polygon Generation to Simple.
It would be less confusing if the Detailed process produced similar results, but it seems to work just fine. While I would love to know how to stop it, even knowing the cause of this or any advice you might have to avoid this would be fantastic.
Thanks for your time,