I am an able bodied adult. A couple of years ago I hurt my foot and went to the hospital. It was a minor fracture of a minor bone, but they ended up putting a cast on to make sure I would not put weight on it for some time.
It was the middle of the day and I was alone when they discharged me from the ER. This was in Poland. The plus side is that the ER bill was $0. The downside is that I had no crutches and no one to help me. There was a medical supply store across the street and a wheelchair I could use at the entrance to the hospital.
I hopped on over to the entrance and sat down in the wheelchair. Wheeling down the smooth floor was no problem. However, once I hit the pavement, things got tough. Every crack and uneven spot was a real obstacle. I got stuck all the time. Each pebble had the ability to stop me in my tracks. Conquering these minor challenges took more physical strength and tactical planning than I anticipated. Keep in mind, this is while rolling down some average pavement.
Eventually, things got harder. Curbs. A proper curb was an impossible challenge. I imagine that someone who has more experience and body strength might be able to somehow get a wheelchair on the curb. I needed to wheel over to a spot where the curb was lower, at a crossing. This added distance but it was necessary. Not that a lower curb was easy. It still required careful planning, strength, and tactical positioning.
Eventually I made it to the store. Walking on crutches was a blessing. Still needed to return the wheelchair to the hospital. This meant doing the same journey, but slightly uphill, while toting crutches.
This was a while back, but I think of this experience regularly. The world is much different for someone in a wheelchair.