This paper explores gender differences in drivers' attitudes toward slow-speed travelers, namely, bicyclists and pedestrians. In exploring the environment-driving-behavior relationship, it differentiates between fast driving environments (i.e., highways and arterials) and slow driving environments (i.e., collectors and neighborhood roads) and posits a dominant culture of fast mobility that engenders aggressive driving behaviors. In this culture, time- and stress-related frustration is a precursor of aggressive driving. The study described in this paper uses data from a survey of drivers in Florida to examine women's and men's attitudes toward slowing down to share the carriageway with pedestrians and bicyclists. It finds differences by gender, with slightly more women likely to be frustrated than men, but male drivers are more prone to behave aggressively.