Shall Alameda County voters authorize a 15-year extension of the 1/2 cent sales tax to fund the following transportation projects: expand BART; increase AC Transit, bus, rail and ferry service; maintain local streets; I-880/ I-680/ I-580/ I-238 improvements; Altamont Commuter Rail; Pedestrian and bicycle access and safety; transit services for seniors and persons with disabilities. All geographic areas shall receive their fair share of revenues. Expenditures shall be audited by a Citizens Watchdog Committee.