I've noticed that travel_time_matrix returns a data frame with less than the expected number of rows (for instance, for a 5x3956 matrix, I'm only ending up with 1335 rows). I'm assuming this is because of origins/destinations that were beyond the maximum travel time, and/or origins that were far from the street network (I'm likely to have a good number of both of these in my dataset). If this is in fact the reason, it should be documented in ?travel_time_matrix.
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