The IIJA (Infrastructure Act) passed last year includes $8+ billion for wildlife and wildlife crossings. Most new highways and road are being planned with some sort of wildlife crossings - usually underpasses - but the overpasses will become more common when possible.
Bretters17 t1_j4a1epk wrote
Reply to comment by Acrobatic_Switches in Corridors between Western U.S. national parks would greatly increase the persistence time of mammals. Establishing an expanded protected area network based on identified mammal pathways and incorporating adjacent wilderness areas would greatly enlarge available habitat for mammal species by Wagamaga
The IIJA (Infrastructure Act) passed last year includes $8+ billion for wildlife and wildlife crossings. Most new highways and road are being planned with some sort of wildlife crossings - usually underpasses - but the overpasses will become more common when possible.
Handy PDF summary here