There are certain motoring accessories especially for the people having disabilities in the upper or lower body.

There should be hand controls for operating the accelerator as well as the brakes of the vehicle. Moreover, the steering wheel should have knobs for helping the disabled person to easily take turns with greater control. Furthermore, there should be wheelchair hoists, ramps, tail lifts and other accessories for helping the person in getting in & out of the vehicle.

There should be cushions and covers for their support. Also the mirrors should be adapted accordingly. The safety belts and harnesses should also be adjusted as per the person’s needs.

If anyone has an upper body disability like they cannot use one of the arms, then their vehicle should be adjusted in the following way:
There should be knob fitted on the steering wheel’s rim. The horn and the indicators should be within the finger’s reach or should be available as a foot control so that the person can easily operate them without releasing the steering wheel. Moreover, the handbrake should be moved to the right side of the driver's seat. Furthermore, automatic transmission and joystick steering should be made use of in a car for a disabled person.
If someone is unable to use both of their arms then they can drive the car with redesigned controls. These cars have a foot steering system.
In case someone has an artificial limb below their elbow, they can still drive by making use of a special concave-limb attachment which fits over the steering wheel. It can fit on the gear lever too.
If someone has a lower body disability, then their car should be adjusted in the following manner:
They could drive a car with automatic transmission where clutch is not used. For someone with a right leg disability, the accelerator could be moved to the left of the foot brake. Moreover, a semi automatic clutch can be used in their car. They can use the manual gearbox without the clutch pedals. Furthermore, hand controls can be used.
There are various accessories as well as adaptations which can be used to make the process of getting in & out of the car easier for the disabled person.
If someone uses a wheelchair then they can get into the car either through the driver's seat, the passenger’s side or the rear. Changes to the car would have to be done according to the choice they make. If someone opts for entering through the driver's side or the passenger's side, then the car doors would have to be made wide enough. Moreover, sliding and swiveling aid would have to be used too.
If someone has to transfer from a wheelchair to a car, then the lifting belts and leg lifters can be availed of as well as hoists and lifts. Moreover, specially converted vehicles are also available which lets the person to drive their wheelchair into it.