http://www.nhtsa.dot.gov/cars/rules/import/FMVSS/#SN101 This is a list of the FMVSS, direct from DOT. It doesn't go into a bunch of detail, rather it lists what that standard applies to.
Once you find the specific FMVSS you're looking for, you can Google that specific one, i.e. "FMVSS 101" and see it in much more detail.
Pretty easy, no?!
