Please, refer to the Site Selection 2: vector analysis module: http://linuxlab.sbs.umass.edu/introFossgisUmass/index.php?title=Site_selection_2:_Vector_Analysis if you don't remember how to perform some of the tasks of this assignment. The data layers you will need are the ROADS and ZONING layers used in that module. If you need to download the files again, you can get them here:http://linuxlab.sbs.umass.edu/beginning-fossgis-umass/datasets/lab_siteselection/siteselectiondata.zip.
Open the attribute table for the road layer and note the field "class":
TIP: Note that the assignment specifies ONLY a subset of roads from the road layer, and you will have to select and extract those features before applying the buffer.
