In this paper, we use the question "what is the true nature of traditional street networks in Turkish cities?" to test different quantitative methods of urban morphological analysis. Traditional Turkish street networks are characterized by discriminant functions of several space-syntax-related indices, as well as by image-analysis and graph-theoretical indices. A set of space-syntactic indices is found to be powerful enough to distinguish the traditional street network among others, particularly axial ringiness, implying that the formation of large blocks is a typical feature. The relative abundance of closed-end edges is found to be another important feature of the traditional street network.