Re: #19
It is not surprising that public universities want to limit the amount of college attendance that any one (state-subsidized in-state) student can enroll in, since they want to ensure that there are enough educational resources for as many qualified students as possible.
Here are some more policies with similar goals:
http://www.sjsu.edu/advising/120plus/
http://ls-advise.berkeley.edu/registration/unitceiling.html (however, AP and IB credit do not count against the unit ceiling, according to http://ls-advise.berkeley.edu/registration/deductible.html )