Last year , the US bike - sharing market had 1.3 million users and about 500 vehicles , however that is projected to grow to more than 3 m members and 51,000 vehicles by 2020 , according to Frost & Sullivan , a research and development firm .
Last year, the US car-sharing market had 1.3m users and about 19,000 vehicles, however that is expected to grow to more than 3m members and 51,000 vehicles by 2020, according to Frost & Sullivan, a research and consulting firm.