Probability of mortality for three different snake species at varying traffic densities based on observed crossing speeds.Traffic densities characteristic of low, medium, and high flows are presented for hypothetical roads. Note that densities achieved in cities, or in some areas during peak patterns (>15,000 vehicles/day) are not represented. Model is adapted from Hels and Buchwald (2001) in which p(death) = 1−e⁻(Na/v(cosα)) where N = traffic density (traffic/lane/day), a = kill zone width, v = average velocity of snake species (m/sec), and α = deviation from a perpendicular cross