"world's largest", which will be used in Beijing. Bi-articulated buses are still rare, having been trialled and rejected in some places. Because of their length they have a role on very high-capacity routes, or as a component of a bus rapid transit scheme. Major examples of bi-articulated buses playing a major role in bus rapid transit can be found in Curitiba, Bogota, Mexico City, Quito, etc. Volvo is a major supplier of puller-type bi-articulated buses in these markets. In the Netherlands, bi-articulated buses came into service in Utrecht (2002) and Groningen (2014) on busy routes. Decks Most articulated buses use a single passenger level or deck. Double-decker articulated buses A few attempts have been made to design a double-decker articulated bus. NEOPLAN Bus GmbH built a handful of Neoplan Jumbocruisers between 1975 and 1992. In these models, only the upper deck allows movement between the two sections, so each section has its own doors and set of stairs. Driver licensing In some countries of the European Union, as well as in Canada, an articulated bus can be driven with the same license used to drive a rigid bus (D in Europe), while a bus towing a normal trailer requires a bus + trailer (D+E) license. There is some confusion as to how the U.S. treats articulated buses, but the general agreement in professional circles a large misconception seems to be that they're treated as combination vehicles, and therefore requires that drivers hold a Class A commercial driver license (CDL) with a passenger (P) endorsement, which requires the passage of both a written and driven exam. However, based on guidelines from the Federal Motor Carrier Safety Administration (FMCSA), an articulated motorcoach (bus) driver is required to possess a Class B CDL. The driven exam can be completed in the Class B bus the driver wishes to operate. It is common for restrictions to be issued on the driver's license disallowing them to operate higher classes of vehicles than they tested on. A common restriction is a driver with a Class B CDL that performs their P endorsement test on a class B bus, resulting in their license bearing the "no class A passenger vehicle" restriction, which is notated with an 'M', in addition to their P endorsement. These restrictions can be removed through further testing at a later date. In the UK it is only necessary to hold a D licence