It's definitely a concern. The answer seems to be to have more of them, not necessarily wider, and to make sure there is cover and protective spaces along them for smaller animals. here's one study from Canada
Having those predators captured inside a smaller area between major roads whith no safe way of getting out, puts a lot of stress on them to find food. This in turn can make them much more dangerous to humans but also other prey animals. Making a safe crossings will give the predators a chance to expand their territory to a more natural size. Similar examples can be found in India with tigers being caught inside a major road network getting really close to humans.