On May 18, 2010 the European Union published the implementing Regulation (EC) No 79/2009 of the European Parliament and of the Council on type-approval of hydrogen-powered motor vehicles that includes measures regarding hydrogen propulsion, hydrogen components and hydrogen systems and for the installation of such components and systems.   Regulation (2009/79)   allows car manufacturers  to apply for the EC whole-vehicle type-approval of hydrogen-powered vehicles on a voluntary basis. The regulation also provides for harmonised rules on hydrogen tanks, including for liquid hydrogen, is necessary in order to ensure that hydrogen vehicles can be refuelled throughout the EU in a safe and reliable manner. The implementing regulation can be downloaded here.