So, in this example, the formatting would look like this:
{{Stub Category|article=[[Road]]s or [[Road Transport]]|newstub=Road-stub|category=Road transport}}
It is also advisable to add it to a larger stub category, if an appropriate one exists. ForCategory:Road stubs, no such category exists however.
In order to increase the category's effectiveness and visibility, it's generally advisable to add your category to several categories. For example, this would add it to the Roads category:
[[Category:Roads]]
When you are done, it is important that you make sure that the new stub and the new stub category are linked correctly to other categories. Using theroad-stub as an example, theroad-stub category needs to be a member ofCategory:Stub categories (because it's a stub category) andCategory:Roads (because it's a category consisting of roads). If your new category has been made from part of an existing stub category or categories, these should also be listed here (so, for example,Category:France geography stubs should be part ofCategory:France stubs andCategory:Europe geography stubs).
Once the new stub category is approved by theWP:WSS (which should normally be done before it is created), to make clear that it underwent the mandatory revision process and was approved by means of consensus, add the {{WPSS-cat}} template to the category page.
If you have doubts or comments regarding any part of the process, do not hesitate to address themhere.