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Some tips for designing a roller coaster:
1. Do whatever you want at first
2. Next do a test run, pay attention to the graph of G-forces, areas with excessive force need the most attention
3. The best way to deal with excessive forces is to introduce a turn or to pitch the vehicle to the left or right, each turn will lessen the amount of G's on the riders. G-forces are the main cause of the extreme ratings of your coasters. It's desirable to have the G-forces never exceed five at any given time - to give you an idea of how intense that is, most average people would pass out from 6 G's, a fighter pilot wearing a suit would pass out from 9 G's. Another little tip that goes with this, it's fine to have a big drop, but make sure the big drop segues off into a small incline and some turns after ward.
4. Excitement determines what people will pay to ride your coaster. Odds are good however that once you've finished building your coaster and tweaking it to not kill everyone who rides, the excitement will not be at the level you want it to. When you place it in your game, plaster objects everywhere around the ride, up to 40 to improve its excitement.
Pic related, it's a coaster I made with this design philosophy a few weeks ago. It was the only coaster I've made that was both profitable and safe.