While making the feed for the Catholic Community Services of Western Washington work in OTP, we hit upon an interesting edge case: what is the expected travel time for services that have more than 2 zones in their stop times which have a time window?

Let me illustrate what I mean with a sketch:

Here we have three zones which all have pretty long time windows. In stop_times the are listed in order and you can get on or off in all zones.

Now, if you're planning a trip from Zone 1 to Zone 3 is the expectation that the trip will always go via zone 2? Or can the shortest path from 1 to 3 be used?

Since services which have more than one zone are pretty rare (I only know CCSWW) and right now the case with more than 2 zones is theoretical I'm wondering what the correct router behavior should be.

Has anyone thought about this yet?

cc @t2gran @vpaturet @tsherlockcraig @jon-campbell-ibigroup @westontrillium