The United Nations Working Party on Road Traffic Safety (WP.1) has approved the adoption of international signage indicating the location of compressed natural gas (CNG) and liquefied natural gas (LNG) fuelling stations.
First initiated by IANGV (now NGV Global) in 2004, the signage has Consolidated Resolution (R.E. 2) status, meaning countries may legally use the signage but are not obligated to do so yet as it is not part of the international road signage treaty, the 1968 Convention on Road Signs and Signals.
Typically R.E.2 status is a step that can lead to including the signage in the 1968 Convention on Road Signs and Signals, which makes them legally binding as international road signs for countries that are signatories to the Convention. NGV Global will continue with efforts to include the signage in the convention but will promote their use in the meantime.
Follow this link for specifications for CNG and LNG signage. Follow this link for the Convention on Road Signs and Signals.