Why Sutchi Hui died

Using the Strava site, cyclist Chris Bucchere was doing what the young men in the video below were doing: racing competitively through city streets. 

With Strava, however, you can do it by yourself, since you're essentially racing against a time, not necessarily against other cyclists on the street at the same time:

Kim Flint (above) was killed while trying for KOM (King of the Mountain) status on Strava. He ran into a car while going 49 miles per hour on his bike in Tilden Park. His parents have filed a wrongful death suit against Strava. Later: Flint's parents lost in court.