; (B) the impacts of traffic speeds, and access to low-traffic stress corridors, on safety and rates of bicycling and walking; (C) tools to evaluate the impact of transportation improvements on projected rates and safety of bicycling and walking; and (D) other research areas to be determined by the Administrator. (3) Vulnerable road user assessments The Administrator shall— (A) review each vulnerable road user safety assessment submitted by a State under section 172(c) of title 23, United States Code, and other relevant sources of data to determine what, if any, standard definitions and methods should be developed through guidance to enable a State to collect pedestrian injury and fatality data; and (B) in the first progress update under paragraph (4)(B), provide— (i) the results of the determination described in subparagraph (A); and (ii) the recommendations of the Secretary with respect to the collection and reporting of data on the safety of vulnerable road users. (4) Submission; publication (A) Submission of plan Not later than 180 days after the date of enactment of this Act, the Administrator shall submit to the Committee on Environment and Public Works of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives the research plan described in paragraph (2). (B) Progress updates Not later than 2 years after the date of enactment of this Act, and biannually thereafter, the Administrator shall submit to the Committees described in subparagraph (A)— (i) updates on the progress and findings of the research conducted pursuant to the plan described in paragraph (2)