This has generated some criticism as its implementation often results in passengers paying more than the necessary fare. This can be due to not having the correct change or, more commonly, tourists and visitors being unaware of the policy until after they have deposited money.
The implementation of this system has been criticized as it frequently results in passengers overpaying for their tickets. This is often caused by a lack of suitable change or travelers/visitors not being aware of the policy until after they have made a payment.