In regions where double-deckers are not common, the term single-decker may lack common usage, as in one sense, all other main types of bus have a single deck. Also, the term may become synonymous with the name transit bus or related terms, which can correctly be applied to double-deckers too. With the exception of regions of major double deck or articulated bus operation, usually urban areas, the single decker is the standard mode of public transport bus travel, increasingly with low floor features.