Great question — answering as the UphillTech team:
There are some bus routes on which have two-way section fares , allowing you to qualify for a lower fare by swiping your card whilst getting off the bus: (2) and (3) At present, there are 38 bus routes with Octopus two-way section fares. Details of these routes are set out in the Annex . In 2017, the average daily passenger trips made on buses under the Scheme was 544 000. In 2017-18 revised estimate, the Government's reimbursement of the revenue forgone to the operators under the Scheme is $1.1 billion. Currently, bus companies do not have information regarding the data of passenger trips enjoying two-way section fares. The complete list of these bus routes can be found in this PDF file...
Full answer by JoErNanO: https://travel.stackexchange.com/a/149432 (CC BY-SA 4.0).
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