Bikeways shall generally not exceed a grade of 3%, except for short distances, and shall be a minimum of eight feet wide. Bikeways shall have a minimum four inch base of crushed stone and a two inch FABC-2 surface course. Where bike paths, located outside street rights-of-way, intersect a street, the curbing shall be ramped for bicycle access to the street grade, and the applicant shall be required to post adequate signs for street warning vehicles of the bicycle crossing.