Say you have to drop someone to a hospital the cost of getting there is 50 euro, you wait 1 hour, do you charge them the same going back? if you live in the town you pick them up. you are going back anyway, I know some drivers wouldn't charge going back, some would charge a little bit and other charge the full amount.
also is it different if the passenger is paying the bill or the State is paying? Tusla, social welfare, the HSE etc