; and (2) subject to subsection (b), the component of the project relating to transit, highway, or rail, respectively. (b) Multiple component projects In the case of a multimodal airport development project described in subsection (a) that involves more than 1 component described in paragraph (2) of that subsection, such project shall only be required to apply the procurement regulations applicable to the component where the greatest amount of Federal financial assistance will be expended. 615. Solar powered taxiway edge lighting systems Not later than 2 years after the date of enactment of this section, the Administrator shall issue an engineering brief describing the acceptable use of durable long-term solar powered taxiway edge lighting systems at basic nonprimary airports (as defined in appendix C of the 2023-2027 National Plan of Integrated Airport Systems published by the FAA on September 30, 2022). 616. Additional ground based transmitters Notwithstanding any other provision of law, the Administrator is authorized to and shall waive any positive benefit-cost ratio requirement for providing additional ground based transmitters for Automatic Dependent Surveillance–Broadcasts (ADS–B) to provide a minimum operational network in Alaska along major flight routes. 617. Automated weather observing systems maintenance improvements Section 533 of the FAA Reauthorization Act of 2018 ( 49 U.S.C. 44720 note) is amended— (1) by redesignating subsections (d) and (e) as subsections (f) and (g), respectively