Introduction

Many cities around the world have introduced bike-share schemes in the past decade. City governments see these schemes as a means to promote several policy goals, including improved connectivity, better public health, reduced pollution, and enjoyment of residents and tourists. 
New York joined this trend in May 2003 when it launched Citibike with an initial 6,000 cycles at more than 100 stations in Manhattan. The scheme subsequently expanded to 10,000 cycles. The distance travelled on Citibikes has now surpassed 3,300,000 miles, equating to just over 13 times the distance between the earth and the moon. 
\({}^{4}_{12}\mathbf{C}^{5+}_{2}\)