They only fly off the track at the top of hills. This is negative g's, just like when you get thrown up against the restraints on any real coaster. The coaster had high positive g's at the bottom of the first hill, but the highest negative g's on the whole ride was like -.23. This coaster would crash in real life, but not in the logic of RCT.
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www.geocities.com/coasting_ohio for Real/Defunct/mini coasters and parks for RCT