This plugin can remove specific taxonomy base slug from your permalinks (e.g. "/genre/fiction/" to "/fiction/").
If you would like to have a little more nice permalinks to your custom post types articles with custom permalinks - this plugin can help you with this. If the term has the same slug as the post type, then the taxonomy has the priority over the post type.
Now I will show some examples:
(Custom taxonomy with child taxonomies)
(Term slug is the same as the post type slug:)
(Post Type:) site.com/cars/ (Term from Taxonomy:) site.com/taxonomy/cars/ (Subterm from Taxonomy:) site.com/taxonomy/cars/bmw
(Post Type:) site.com/cars/ (will not show) (Term from Taxonomy:) site.com/cars (will show) (Subterm from Taxonomy:) site.com/cars/bmw (will show)