General Motors said it would introduce a fleet of autonomous Chevrolet Volts in late 2016 on its Warren Technical Center campus for employee use. The company also announced a New York City ride-sharing project and unveiled a concept electric bicycle as it expanded its efforts to provide alternative mobility options. In addition, CEO Mary Barra said, GM’s joint fuel-cell work with Honda will produce a fuel-cell vehicle by about 2020. Barra and other senior GM executives spoke to analysts and large investors Thursday at the company’s Milford Proving Grounds.