Chapter 18.2.4 GENERAL REGULATIONS FOR BASE ZONES This chapter is included in your selections. Sections: 18.2.4.010 Access and Minimum Street Frontage. 18.2.4.020 Accessory Structures and Mechanical Equipment. 18.2.4.030 Arterial Street Setback. 18.2.4.040 Vision Clearance Area. 18.2.4.050 Yard Requirements and General Exceptions.