Title 23 › Chapter CHAPTER 1— - FEDERAL-AID HIGHWAYS › § 172
Requires the Secretary of Transportation to study how to cut collisions between cars and wildlife and how roads affect animal habitats. The study must update the 2008 reports, look at causes and effects of wildlife-vehicle collisions, and examine how roads and traffic hurt habitat connections for land and water species. It must find solutions and best practices. To do that, the Secretary must review research and data, survey Federal and State transportation practices, and talk with experts. The Secretary must send Congress a report within 18 months after the Surface Transportation Reauthorization Act of 2021 is enacted. The report must describe causes and impacts (including effects on species listed as threatened or endangered under the Endangered Species Act, species states call “greatest conservation need,” species in State wildlife plans, and medium and small terrestrial and aquatic species), include an economic analysis of costs and benefits (including effects on jobs, property values, and economic growth for society, nearby communities, and landowners), give recommendations and best practices, and offer guidance for voluntary joint statewide transportation and wildlife action plans for any State that wants to participate. The Secretary must also create in-person and online training courses within 3 years to reduce collisions and improve habitat connections, make them available to transportation and fish and wildlife professionals, and update them at least every 2 years. The Secretary, through the Federal Highway Administration, must make a standard, high-quality method to collect and report exact location data for wildlife collisions and carcasses on the National Highway System, keeping technology and cost in mind. That work must review existing systems (for example, FARS and other crash data systems), try to fix their limits, and include consultation with federal, Tribal, State, and local transportation and wildlife agencies, planning organizations, experts, and other stakeholders. A template for State use should be developed and promoted voluntarily. A report describing the method must go to Congress no later than the later of 18 months after enactment or 180 days after the method is finished. By 4 years after enactment the Secretary must report to Congress on how much the voluntary system is being used, whether it helped reduce collisions or improve connectivity and by how much, and any further recommendations. The Secretary must also give voluntary guidance to States on when a highway should be checked for fixes, using a threshold that looks at human safety risks from collisions, highway-related wildlife deaths and effects on listed and State-priority species and medium and small species, and the road’s barrier effect on animal movements.
Full Legal Text
Highways — Source: USLM XML via OLRC
Legislative History
Reference
Citation
23 U.S.C. § 172
Title 23 — Highways
Last Updated
Apr 6, 2026
Release point: 119-73