if $car !="Taxi" then sleep(900)
I think that the best method that I've seen suggested for solving this is to ensure that the difference between a Taxi and a Mini Cab is to do with pre-booking.
Taxis should have a higher threshold for driver training, checking, licencing and insurance, etc, and in return they get the benefits of being a registered taxi. This would include the use of bus lanes, and the ability to pick people up instantly, whether hailed in the traditional on-street manner, or via an app.
Mini cabs get to have a lower threshold for those things, but can't use bus lanes, and have to be booked at least 15 minutes in advance.
This helps to distinguish between the two services, and ensures user choice is preserved. If you can wait 15 minutes (or book knowing your train/flight etc arrival time) then you get the benefit, if you need something now, you may have to pay more.
Biting the hand that feeds IT
