In cities or areas with low-density traditional static route transportation does not work well, and with the ubiquity of mobile phones and easy communication, there is no need to rely on this type of transit.   If a passenger can communicate his or her destination and current location to the transit operator (similar to calling a taxi, except without the need to directly talk to a dispatcher) then the transit company should be able to create optimal bus paths in real time to better serve customers.

via Research « Progressive Transit.

Network-Inspired Transportation System research at Georgia Tech