Many people enjoy cycling in London, but competitive urban road racing is highly dangerous. It's hardly surprising pedestrians and motorists are worried about these lycra clad racers.
And this is just one of many such apps.
Virtually every road of interest to cyclists now has a "Segment", enabling competitive racing to take place at any time.
Every day, thousands of cyclists are using this app to race each other or record personal bests, not just on roads, but also on paths, paved areas and off road tracks, with complete disregard for others.