Getting in is easier if the door opens wide and the door sill is low. If you are particularly large or tall, or have stiff legs or neck, you should choose a car with comfortable amounts of headroom and legroom. You may prefer a high or a low seat to make getting in and out easier. If you are transferring from a wheelchair, you will want the car seat to be as close as possible to the height of your chair.
Door opening angle - Driver
Legroom getting in - Driver
Headroom when getting in (seat edge to top of door) - driver
Door sill height to floor of car - Driver
Min seat edge to ground - driver