The purpose of this district is to provide for uses in addition to those specified in C-1 districts and thereby provide service and sales in support of the primary business activities in the community. This district includes activities which, because of their nature, such as their tendency to encourage traffic congestion and parking problems, storage problems or certain other inherent dangers, create special problems and are, therefore, best distinguished from other commercial activity. Their location is advantageous at the edge of the central commercial core and at specified points on major thoroughfares at outlying locations in the community.