An OPDMD is any mobility device powered by batteries, fuel, or other engines that is used by individuals with mobility disabilities for the purpose of locomotion, whether or not it was designed primarily for use by individuals with mobility disabilities. OPDMDs may include golf cars, electronic personal assistance mobility devices, such as the Segway® Personal Transporter (PT), or any mobility device that is not a wheelchair, which is designed to operate in areas without defined pedestrian routes. Covered entities must make reasonable modifications in their policies, practices, or procedures to permit individuals with mobility disabilities to use OPDMDs unless the entity can demonstrate that the class of OPDMDs cannot be operated in accordance with legitimate safety requirements adopted by the entity.
For additional information, take a look at the following resources:
Fact Sheet: The ADA & Accessible Ground Transportation