Interstate 45 have a southern terminus in Galveston and serve as a main artery to Galveston from mainland Galveston County and Houston . Farm to Market Road 3005 ( locally called Seawall Boulevard ) connect Galveston to Brazoria County via the San Luis Pass @-@ Vacek Toll Bridge . State Highway 87 , known locally as Broadway Street , connect the island to the Bolivar Peninsula via the Bolivar Ferry . A project to construct the proposed Bolivar Bridge to link Galveston to Bolivar Peninsula was cancelled in 2007 .