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To visualize the flow of yellow taxi trips from pickup borough to drop-off borough, click + Add in the menu.

Select the Sankey visual type, specify the following on the Field wells.
pu_boroughdo_borough
Create a filter focus on taxi trips originating from Manhattan.
Type pu_borough and then select it.
Click on the menu besides the pu_borough filter, select Edit.
Deselect Manhattan from the Filter list, click Apply.

Get insights by examining the taxi trip flow based on pickup borough and drop-off borough.
Observe the traffic flow patterns.