A mere sprinkling of autonomous vehicles exist in a few dozen cities today. And none of them -- at least not yet -- have been deployed as a true commercial enterprise. While the bulk of this nascent industry fixates on the system of sensors, maps and AI necessary for vehicles to drive without a human behind the wheel, the founders of startup RideOS are directing their efforts to the day when fleets of self-driving cars hit the streets. It's there, where human-driven and automated vehicles will be forced to mingle, that RideOS co-founders Chris Blumenberg and Justin Ho see opportunity. The company, which has existed for all of 12 months, has raised $25 million in a Series B funding round led by Next47, the venture arm of Siemens. Sequoia, an existing investor, and Singapore-based ST Ventures, also participated in the round.