I'm especially concerned with the acceptance and adoption of Shared Autonomous Vehicles by older adults. There is a high correlation between perceived trust and the use of SAVs. Trust comes in part from ease of use and the perception that a person will be able to safely initiate and complete a ride.
For older adults, I think the following might prove to be important:
Rails and handles to grasp
Ability to see into the vehicle before entering to ensure safety
Help buttons and real-time two-way communication
Easy to deploy safety belts
Extra time to enter and exit the vehicle without fear of doors closing or scary warning signals