Yup. By the state fair near me they added swings this year that are like 400 feet in the air! Tons of people went on it cuz i see it from my house too:P ha. Don't be scared of rides, remember they are there for fun in the first place and if it wasn't safe people would know and it wouldn't be there in the first place:)
I mean if they are on display then you can ride them. I'm pretty sure they have certified people to check up on them to see if they can operate well otherwise they wouldn't be out there for use i'm guessing.