Can I use CoreGRAVEL™ for an ADA-compliant surface?

 Yes!
Soft surfaces are difficult for people with mobility impairments to negotiate and therefore should be avoided. CoreGRAVEL allows a natural look, yet still able to be navigated by road bicycles, strollers, and wheelchairs not designed for outdoor terrain. The ADAAG states, "materials stabilized and retained by permanent or temporary geotextiles (mesh), gridforms, or similar construction may perform satisfactorily for persons using wheelchairs and walking aids."
Learn more:
ADA Accessibility Guidelines (ADAAG) - Ground & Floor Surfaces 
https://www.access-board.gov/guidelines-and-standards/buildings-and-site...
US DOT Federal Highway Administration: Designing Sidewalks and Trails for Access
http://www.fhwa.dot.gov/environment/bicycle_pedestrian/publications/side...
ADA Homepage
http://www.ada.gov