A historical figure known for riding in a convertible car and waving to large crowds is former U.S. President Franklin D. Roosevelt, who famously appeared in such parades during his presidency.

The claim that Franklin D. Roosevelt (FDR) was known for riding in a convertible car and waving to large crowds during parades is not supported by historical evidence. While FDR did participate in public events and used a presidential state car, sources indicate that his mobility was severely limited due to his paralysis from polio, and he was typically transported in enclosed vehicles for safety and comfort. The first official presidential state car with advanced features appeared during his presidency, but there is no reliable documentation of him riding openly in a convertible and waving to crowds, unlike later presidents such as John F. Kennedy. The sources provided are mostly non-trusted and do not offer direct evidence confirming the claim. Historical records and trusted accounts generally associate open-car parades with other presidents, not FDR.