Maryland drivers say, especially late at night, they fear turning wildlife into roadkill.
University of Maryland professor Ed Gates hopes his new study will curb the problem.
He mounted 300-cameras in culverts passing under roadways across the state and captured thousands of infa-red images. In all, he photographed 57 species traversing through culverts, including some homo sapiens.
"You know most cases they were unaware they were even being photographed," Gates says.
Until recently, engineers built culverts about four-feet-tall strictly for streams and stormwater runoff.
But now, in projects like the Intercounty connector, they're building culverts as tall as 17 feet in diameter to allow for wildlife to pass through.
Rob Shreeve with the state highway administration says that all along the ICC, eight-foot-tall fences help guide wildlife through the giant tunnels.
"And it's buried into the ground to keep anything from burrowing under it," he says.