Photo by amesis On Friday, D.C. Mayor Adrian Fenty and District Department of Transportation Director Gabe Klein were joined by Arlington County Board Chairman Jay Fisette to announce a new regional bike-sharing service. The new system will bring 1,100 bikes to 114 stations throughout Arlington and D.C., enabling free egress between the District and the Commonwealth. Once it launches later in the year, it will be the largest bike-share program in the country. But no…