Motorcyclist Advisory Council Act of 2021 This bill provides statutory authority for the establishment or designation of a Motorcyclist Advisory Council whose duties are to advise the Department of Transportation, the National Highway Safety Administration, and the Federal Highway Administration on transportation safety issues of concern to motorcyclists, including (1) motorcycle safety; (2) barrier and road design, construction, and maintenance practices; and (3) the architecture and implementation of intelligent transportation system technologies. The bill also sets forth the membership of the council, member terms, and reporting requirements.