Research overview: roads as risk and movement filters

Roads influence felid movement in layered ways, and this overview synthesizes how telemetry reveals them acting simultaneously as sources of mortality, physical and behavioral barriers, and selective filters on who moves where. Some cats avoid roads entirely, others cross only at certain times or places, and a bold few traverse busy highways at great risk, so roads filter movement by individual behavior and context. The overview discusses how step-selection analyses quantify avoidance, how mortality data expose the lethal dimension, and how the combined effect fragments populations and biases which animals successfully disperse. It frames roads not as simple lines on a map but as complex, dynamic features whose impact depends on traffic, design, surrounding habitat, and the behavior of the cat. Understanding roads as multifaceted filters is central to mitigating their effects on felid movement.