In the early 1990s, Minnesota became the first state in the nation to prohibit discrimination based on a person’s sexual orientation and gender identity. Yet the state continues to use male-female categories when investigating the role of gender in transportation issues such as travel behavior and transportation accessibility. Since a person’s identity can have a significant influence on their own and others’ behavior and experiences, excluding gender diversity in this type of transportation research could result in an incomplete understanding of the issues and perceptions about quality of life.