Sign D9-11e “Alternative Fuel – Liquefied Petroleum Gas” from FHWA Interim Approval 13, intended to be added to the <i><a href="https://en.wikipedia.org/wiki/Manual_on_Uniform_Traffic_Control_Devices" class="extiw" title="w:Manual on Uniform Traffic Control Devices">Manual on Uniform Traffic Control Devices</a></i>, with text converted to paths for display.
Federal Highway Administration
<a rel="nofollow" class="external text" href="https://mutcd.fhwa.dot.gov/resources/policy/alt_fuel_corridors/">Signing for Designated Alternative Fuels Corridors</a>