They are after all responsible for the lives of the people that they transport, not so? For instance: if you want to become a taxi driver, in addition to your normal driver’s licence, you should also have a special taxi licence. To obtain this licence, you must first pass an advanced driving course, and write a rigorous exam on the rules of the road, and get tested thoroughly on it. Then, and only then, if you passed these criteria, will you be issued with a taxi licence. And you should only be able to buy a minibus if you already have the abovementioned licences, like when you want to buy a new TV and need to produce a TV licence first. Taxi drivers should also be forced to have their taxis checked for roadworthiness at least every quarter, and for this you get a stamp, like a servicing stamp. They should also have a refresher driving course every two years or so. And then of course there is the policing. If you are a taxi driver, and you are caught committing a traffic offence, or without the taxi licence, or proof of recent roadworthy checks, you should be fined heavily, and “marked” on the traffic system.
You then get 30 days to get your stuff in order. If you are caught again, your taxi is impounded and your taxi licence removed, and only when you have complied with all of the requirements all over again, and paid another fine, can you get your taxi back. Normal traffic offence fines for taxis should be higher than for other motorists, especially if you have passengers when you are caught, because you are endangering innocent people's lives. If we can better regulate, and properly train and police our minibus taxis, making them safe and trustworthy to use, we will have a fantastic ready-made public transport system that is different from anywhere in the first world. A public transport system that actually collects and drops you at your door. Imagine how fantastic that would have been for 2010!
If this is done without fear while bribes are not been taken by traffic officers (it is possible), then we will have a safer public transport for all. Not every Tom, Dick and Harry should just be allowed to drive passenger just because they have a license.