SoftBank chief Masayoshi Son pitches a new path for self-driving cars

Masayoshi Son has long prided himself on his ability to detect big shifts in technology early on. During his four decades leading SoftBank, a free-spending Japanese investment group, the billionaire has made some spectacularly successful investments. And some epic flops.

In recent months, Son has been laying out plans for a new big bet: self-driving cars.