Arlington County is preparing to roll out a bike-sharing program in the fall that local officials hope will help fuel demand for bike transit and help relieve congested roadways and trains.

The program, called Nextbike, will feature between 100 and 200 bikes that will be tied up with cable locks at an estimated 40 orange Zipcar poles along the Rosslyn–Ballston corridor, as well as in front of Metro stations, county bike-sharing consultant Paul DeMaio said.