Hi Susy. I reverted your edits to B-train as you should explain the edit on the talk page or edit summary, not in the text. B-doubles/B-trains only have two articulation points, and the article does not say they would be allowed on all roads. They are limited to specific routes in Australia too. Most inter-city routes are permitted, but not narrow or winding roads. --Scott Davis Talk 11:47, 16 October 2016 (UTC)