Neither USGBC or GBCI has provided a mandatory signage design, but there has been consistent guidance indicating that one or more of the following terms must be on the sign:

Low-EmittingFuel-EfficientZero EmissionsACEEE 40+

Some project teams have struggled with this because they think it does not clearly convey the concept to occupants, but nonetheless, this has been the pattern of review comments from GBCI. For projects that want to use additional terms, they may use one of more of the above terms, in combination with any of the following terms.

Alternative Fuel VehiclesHybrid VehiclesElectric Vehicles

These terms are not sufficient on their own, however, as not all hybrid vehicles are low-emitting, for example.