How detailed should I make the shapes.txt for a General Transit Feed?

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I am working on creating a transit feed with General Transit Feed Specifications in mind. I'm torn into how detailed the routes should be for the shapes.txt. Do I map just when the bus is on the main road? Or should I show what parking lot entrance it uses or how it turns around at the end of the road?

Is this all preference and I'm just being too obsessive?

Here's a picture of when I took the bus route off the main road to show how it reaches the bus stop. Is this necessary?





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