According to Fortune Magazine, Cambridge Mobile Telematics has quietly become one of the most important companies you've never heard of in the race to make driving safer-and now some of the world's biggest insurers are doubling down on it. The Cambridge, Mass.-based company has secured a $350 million strategic investment led by TPG's Rise Funds and Allianz X, Fortune exclusively learned, with existing backer State Farm also participating in the all-secondary deal.