Chapter 20.20 RESIDENTIAL DISTRICT REGULATIONS This chapter is included in your selections. Sections: 20.20.010 Scope of regulations. 20.20.020 ES-R, R-1 and R-1A district signs. 20.20.030 R-2 and R-2A district signs. 20.20.040 R-3 district signs. 20.20.050 R-4 and R-5 district signs.