Considernig the way kids on BMXs ride here, which can at best be described as 'erratic', I'm surprised there aren't more stories like this. My guess would be that he swerved suddenly into the path of the car without checking behind first.

Interesting that there's no mention of whether he was wearing a helmet. My observation has been that if they aren't wearing one it get mentioned, but otherwise the silence is deafening.

A link to the actual story would help.