The "Improving Accessibility Through Microtransit Act" directs the Secretary of Transportation, through the Federal Transit Administration, to establish a competitive grant pilot program. This program aims to enhance the availability of accessible microtransit services for individuals with disabilities or mobility impairments, including those who use wheelchairs. Eligible entities, such as State, local, and Tribal governments or metropolitan planning organizations, can apply for these grants. Applications must describe the types of disabilities served, the geographic area, and may be submitted on behalf of public-private partnerships. The Secretary will prioritize applicants demonstrating how their proposed microtransit services will provide greater accessibility, address existing service gaps, and deliver economic benefits like improved access to jobs. Allowable uses for grant funds include purchasing or leasing wheelchair accessible vehicles , funding driver training and continuing education, acquiring software, and contracting for operations. Each grant is limited to $3,000,000, and recipients must install and maintain interior camera systems on vehicles. The program is authorized for five years with an appropriation of $20,000,000.