What technologies are used in cars to help paraplegics and quadriplegics drive?

Answer 1

Currently there are no technologies that I am aware of for quadriplegics to drive cars that are certified for use. There are technologies for moving a motorized wheelchair with a mouth "puffer" or "joystick", however typically quadriplegics are not independent enough to be able to place themselves into a wheelchair after driving is completed. This means they must rely on the help of another for driving purposes as there's no technology present that can be used once a quadriplegic person arrives at the destination for the transfer of themselves to the wheelchair.

Paraplegics do have systems that assist for driving purposes. It's a bar of buttons that typically sit below the steering wheel that they can control with their fingers for braking and acceleration. These systems do come at a cost and are aftermarket systems, so some paraplegics opt for "alternative devices" such as canes attached to objects to push the pedals that are still located on the floor.

As a side note the buttons used for those with paraplegia are also useful for those that are vertically challenged (aka short statured people that literally cannot reach the gas/brake pedals of the car).