I'm a size 12 with big bottom and thighs, in some rides I felt that if I weighed a little more I might not fit.
A lot of the Rollercoasters do not but some are pretty spacious. Most rides do have a test coaster out front so you can test if you will fit before getting in line.
Just a few rides accommodate plus size at least up to size 14 to 16 women most all rides.
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