I think it is in the owners manual, if I remember you want the wheel further away than is comfortable for driving. I have a daughter that is 4'10" and that makes her right next to the air bag on her car, any further back and she cant see or reach the pedals. her car for now is an old car that had a small accident that deployed the air bag so I feel better that she won't have an air bag deploy with her only six inches away from it. I wish the new cars would adjust for the size of the person so a 100 lbs person would not get hit with a 250 lbs air bag charge. I know I am not wording this very well but I think you get my point.
Dr. House rides a motor cycle and drives an old Chrysler product....... Airbags are designed to factor in the weight of a driver or passenger. The lighter you are the less force. This is designed in case a young adult or child is seated in the front seat or the driver is a light weight.
Although I love my Prius C I can understand why there would be rear end collisions, I am 5'4" and cannot see my hood at all. I have only been driving it for a week now and need to get used to the fact that I need to stop 5' or so behind another vehicle. This is the first vehicle that I have owned that I can't see the hood while driving.
That is just the way cars are made now. I am 5'8" and I had a 2011 Prius. I could not see the hood in it. I just traded it for a 2014 Avalon and I can't see the hood in it either. Can't see out of the rear of either car but I have a backup camera in the Avalon and a rear cross traffic monitoring system in it so no problems to the rear in the Avalon.
That is why in Japan they sell antenna poles that mount at the front corner of the car opposite the driver. These poles help you know where the front of the car is during parking.
Used to do the same here many years ago but no more, that is in the past. You just have to try to guess now, which is only successful part of the time. That's progress I guess.