With the custom roadway tool there is always an outline, even where it are supposed to be joins though you can disable showing joins for any other roadway. It would be nice if I could indicate the roadway joins with e.g. a locus point to have that side not show joins like the standard roadways. It just looks so odd when all other roads show no joins (my default setting in most cases) and a custom roadway does all the time because it has an outline all around.