I don't know how many steps the average driver climbs a day but it adds up fast...just the 6 steps for each stop in and out of the car will jack up your knees...ups knows this but of course won't do anything about it except to keep telling us to grab the rail...look at many of the drivers who are getting in and out of the car, most will reach for the rail but many won't let the grip take any pressure off their knees. .it's all just for show.