I have noticed that some people on this site change the default G-force limits so that they change from green to yellow/red at differnt limits. This creates the problem of different people rating things differently. A simple way to solve this is to reset the defaults. Another way to regulate the positive G's (which is where most of the trouble is) is to set the defaults to real human standards, which would make the regions be approxamately thus:
Green: 0 - +2.9 G
Yellow: +3.0 - +5.0 G
Red: +5.1 & ^ G
Also, a notice for all people. When rating, any coaster whose positive G level exceeds seven, no matter how good and smooth it is, should be severly penalized because +7 G's is where the human body either blacks out, risks blacking out, or risks damage. The reason for dividing the zones as such is that from 0 to +3 G's, we're fine. Starting at +3 G's, we begin to loose perehipheral vision, with more vision loss as G's increase. +5 G's is the common threshold for blackouts, so anything above that should be in the red. However, a gradual increase into the yellow or LOW red would be OK, because it would allow the body to get gradually used to the G's. NO SPIKES.
That's all I really had to say. If you want a more detailed analysis about this subject, I'll write an article about it.[:p] Otherwise, just watch how you're rating the G's.
Thanks,
Tarzanman
Edit: For more info/my sources...
http://www.saferparks.org/safety_regulation/%20astm_f24/astm_gforce.htm
http://www.stanford.edu/dept/news/pr/02/centrifuge320.html (On the second one...scroll down about halfway)