Instead of tiered licensing, I would rather see the basic class as the requirement for getting a motorcycle permit and then an approved intermediate or advanced class must be taken to get a license. After all in most states you can walk in take a written test and get a permit and be allowed to operate a motorcycle on the road at that point. As for studies done, MSF did one a few years back that determined that completion of the BRC did not change fatality rates in riders who took it vs riders who did not. They also determined that riders who did follow up training on their own bikes did have a reduced fatality rate and this was presented at the International motorcycle conference in Florida. The Military also saw a reduction in fatalities ranging from 36% to 64% when riders were required to participate in advanced training on their own bikes. The difference in percentage comes from the different branches having different requirements on what classes and how many were required i.e. the Army and Navy only required Basic and Intermediate level training but the Marine Corp required Basic, Intermediate and Advanced Level Training.