Yahoo Japan invests $4.4m in Softbank-backed SB Drive Screencap of SB Drive promotional video. Shiwen Yap March 24, 2017 PremiumYahoo Japan is investing JPY 490 million ($4.4 million) in SB Drive, an autonomous bus unit within the SoftBank Group. Continue reading this story with a subscription to DealStreetAsia. Subscribe Already a subscriber? Log in Should your colleagues be reading this article too? Contact us for corporate subscriptions at email@example.com.