Title 23 › CHAPTER 1 — FEDERAL-AID HIGHWAYS › § 172
The Secretary of Transportation must study how well people and agencies are using methods to cut down crashes between cars and animals and to keep habitats connected. The study must update two 2008 reports, look at causes and effects of animal-vehicle crashes, and look at how roads and traffic break up habitats for land and water species. It must review research and data, ask state and federal transportation agencies what they now do, and talk with experts. Not later than 18 months after the Surface Transportation Reauthorization Act of 2021 becomes law, the Secretary must send Congress a report. That report must describe causes and impacts, give an economic look at costs and benefits of fixes, offer recommendations and best practices, and give guidance for voluntary statewide plans to reduce crashes and improve habitat connections. Based on that study, the Secretary must create in-person and online training within 3 years of the Act and keep the courses updated at least every 2 years. The Federal Highway Administration must also make a standardized, quality method for collecting accurate wildlife-collision and carcass data on the National Highway System, review current systems, and consult with Interior, Agriculture/Forest Service, Tribal, State, and local authorities, MPOs, transportation and wildlife groups, experts, and NGOs. The Secretary must give Congress a report on the method by the later of 18 months after the Act or 180 days after finishing the method, and a report on voluntary use and its effects by 4 years after the Act. The Secretary must also create voluntary guidance with a threshold to decide when a highway should be reviewed, based on collision counts that threaten people, harm to listed or state-priority species (including medium and small species), and how much the road blocks animal movement.
Full Legal Text
Highways, Source: USLM XML via OLRC
Legislative History
Reference
Citation
23 U.S.C. § 172
Title 23, Highways
Last Updated
Sep 22, 2026
Release point: 119-110