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  • Interesting idea. I've added another violation in my PPS to the OP. Please take a look and see if you can see an explanation there.
    – A. Rex
    Commented Jan 10, 2009 at 2:37
  • Zoom WAY down on point A--one click from max. Note how the three-point route goes west, south, east. I think we are looking at an algorithm that doesn't like to backtrack unless it was necessary to go through a chokepoint.
    – Loren Pechtel
    Commented Jan 10, 2009 at 4:30
  • In my PPS example, change the starting address to "10 Avenue de Flandre, 75019 Paris". This removes the little backtrack that you're talking about but the problem is still there. I think the main issue is that it really wants to stay on that main Blvd ...
    – A. Rex
    Commented Jan 10, 2009 at 6:46
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    I think I found it in this case: Do those by car and the timings make sense. It probably sees the big road as faster and the walking route doesn't throttle it.
    – Loren Pechtel
    Commented Jan 10, 2009 at 17:32
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    P.S.: The initial problem also makes sense by this standard, it might not be the backtrack that caused it.
    – Loren Pechtel
    Commented Jan 10, 2009 at 17:33