The Independence Blue Cross Broad Street Run returns Sunday, May 3, bringing the city’s biggest road race back to Broad Street for its 47th year. Runners will be selected through a lottery system or can run on behalf of a participating charity. The 10-mile race starts at Broad Street and Somerville Avenue at 7 a.m. and finishes at the Philadelphia Navy Yard. Spectators are encouraged to cheer along the route and attend the finish-line celebration at the Navy Yard, which will include a family-friendly activity area. The Broad Street Run began in 1980 with about 1,500 runners.