(REUTERS)  Ford Motor Co plans to offer a fully automated driverless vehicle for commercial ride-sharing in 2021, the automaker announced Tuesday, expanding its efforts in driverless cars and ride sharing – two areas where rivals have already made inroads. To help speed development of self-driving cars, Chief Executive Mark Fields said Ford is hiking investments in Silicon Valley technology firms, tripling its investment in semi-autonomous systems, and more than doubling the size of its […]