True, and GPS navigation can have real-time traffic information while a cabbie can at best make an educated guess.
What's _really_ valuable, though, isn't real-time traffic information, but future traffic information. What matters isn't the traffic right now, but the traffic as it will be when you arrive at a given portion of the journey. I suspect that at present cabbies have the edge there, but that edge will also be swept away by predictive algorithms incorporating knowledge of typical traffic patterns plus lots of inputs about events that may affect traffic.
The latter point is particularly interesting if a navigation system acquires enough scale that it is directing a substantial fraction of the traffic. In that case, it knows not only what external events may affect traffic, but can further make decisions to control the flow, distributing and smoothing.
My point was that a cabbie doesn't have to guess if the GPS can provide the info. There's no rule saying that black cab drivers aren't allowed to use technology when it's useful.
A driver would actually be listening to the two-way radio fitted in the taxi to stay informed of traffic conditions and incidents; in real-time and with far more information to plan alternate routes.
Sometimes the existing technology is still better.
What's _really_ valuable, though, isn't real-time traffic information, but future traffic information. What matters isn't the traffic right now, but the traffic as it will be when you arrive at a given portion of the journey. I suspect that at present cabbies have the edge there, but that edge will also be swept away by predictive algorithms incorporating knowledge of typical traffic patterns plus lots of inputs about events that may affect traffic.
The latter point is particularly interesting if a navigation system acquires enough scale that it is directing a substantial fraction of the traffic. In that case, it knows not only what external events may affect traffic, but can further make decisions to control the flow, distributing and smoothing.