The overarching goal of this dissertation is to examine the spatial, temporal, and modal disparity of access across America. This is achieved by posing three research objectives. The first objective determines the spatial and temporal disparity of transit and automobile access gap, its impact on transit use, and its socioeconomic and built environment correlates. The second objective examines the spatial and temporal disparity of slightly and extremely risky bike infrastructure and measures the social inequity of access to bike infrastructure. The third objective indicates spatial transit access mismatch between high- and low-wage employment across metropolitans. Three findings are discerned. First, the access gap between transit and automobile has a disproportionate effect on African Americans, low-income households, millennials, and car-free households. Second, socially vulnerable communities residing African Americans, Hispanics, and car-free households have the least access to slightly risky bike infrastructure and yet the least prioritized in urban planning and bike infrastructure investments. Third, transit acts as a catalyst to widen spatial mismatch and discriminate socially vulnerable population particularly African Americans and car-free households