BCBS Sponsors Free Bluebikes Adventure Passes In recognition of World Car Free Day, Blue Cross Blue Shield of Massachusetts (“Blue Cross”) is sponsoring free Bluebikes Adventure Passes on Thursday, September 22. Unlimited two-hour Adventure Passes, for a 24-hour period, will be available across the Bluebikes system’s 11 municipalities: Arlington, Boston, Brookline, Cambridge, Chelsea, Everett, Newton,