Rocky Barker has a short and interesting blog as to how the presence of roads affects the interaction of predators and prey.
Yellowstone moose use roads to outsmart grizzly bears. By Rocky Barker. Idaho Statesman.
Update: I just found this. It’s the same story with a somewhat different slant on the matter. It’s from Science Daily Study: Moose move toward humans for safety.
10-13. More still on the moose/grizzly bear/roads story. Mother moose know best. Bears avoid park roads, so expectant ungulates stay close. By Mike Stark. Billings Gazette Staff