Iowa Department of Transportation on deer crossing signs

More dying deer mean safer U.S. roads – The Denver Post

State & Union: Increased risk of deer on roadways, News

Maine ranks as high risk, and 22nd nationwide, in animal collision study

Drivers chuckle at funny highway message signs

Number of car crashes involving deer bucks up in October

Munson: Life-saving messages spark Iowa's roadside quips

MnDOT Research

Safe passage: Sardine Canyon wildlife crossings improved, Allaccess

Wildlife crossings, the Wyoming way: How a fiscally conservative state with a wildlife-oriented culture has emerged as a leader in efforts to make roads safer for animals and motorists, Environment