These districts are designed to provide for local shopping and include a wide range of retail stores and personal service establishments which cater to frequently recurring needs. Since these establishments are required in convenient locations near all residential areas, and since they are relatively unobjectionable to nearby residences, these districts are widely mapped. The district regulations are designed to promote convenient shopping and the stability of retail development by encouraging continuous retail frontage and by prohibiting local service and manufacturing establishments which tend to break such continuity.