Black taxis challenge US car service Uber for streets of London

LONDON: They have been the kings of the British capital's roads for over a century but now the often opinionated drivers of London's iconic black taxi cabs are battling a high-technology rival that threatens their dominance. 

In their sights is Uber Technologies Inc, a San Francisco-based company whose application lets people summon rides at the touch of a smartphone button and uses satellite navigation to calculate the distance for fares.