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< h1 > < a class = "header" href = "#multi-modal-trips" id = "multi-modal-trips" > Multi-modal trips< / a > < / h1 >
< p > A single trip consists of a sequence of < code > TripLegs< / code > -- walking, operating a
vehicle (car or bike), and riding the bus. Depending whether a trip begins or
ends at a border or building, there are many combinations of these sequences.
This is a way to categorize them into three groups. I'm not sure it's the
simplest way to express all the state transitons.< / p >
< h2 > < a class = "header" href = "#walking-only-trips" id = "walking-only-trips" > Walking-only trips< / a > < / h2 >
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< h2 > < a class = "header" href = "#trips-starting-from-a-border" id = "trips-starting-from-a-border" > Trips starting from a border< / a > < / h2 >
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< h2 > < a class = "header" href = "#trips-starting-from-a-building" id = "trips-starting-from-a-building" > Trips starting from a building< / a > < / h2 >
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