The "knowledge" is a very valuable skill/infoset. The actual driving and interacting with customers is much less valuable. So maybe the way forward is to separa

The "knowledge" is a very valuable skill/infoset. The actual driving and interacting with customers is much less valuable. So maybe the way forward is to separate the two skills. Folks with the "knowledge" could act as centralized route planners. The can provide many more routes in the time they could drive one (i.e. a single cabby driving might do 1 call every 20 minutes... but could easily do 10 route plans in the same time). Essentially when someone asks the minicab driver "take me to X", the driver relays this information to a black cab driver at a desk who sends back a custom route. With GPS to identify the starting point and VOIP (via wireless) this could be as easy as a driver using a traditional radio (press the mike button, speak the destination, and viola the route appears on a dash mounted map along with spoken instructions). Very much like the existing examination question/answer format. Maybe you would also need to rotate the route planners out as drivers 1 week out of 4 so they keep up with the "knowledge".