Fig. 3. The predicted fraction of occupied patches as function of traffic volume on the roads surrounding traffic-calmed areas for different sizes of habitat patches. The total number of patches is 25, with one per grid cell in a given road network. The solid line is for patches covering 20% of each grid cell; the broken line is for patches covering 15% of each grid cell. Parameter values (see Appendix 1 for definitions): α = 1, δ = 0.3, wc = 2, lc = 5, vc = 20, la = 1.4, va = 5.2, wa = 0.4 (roe deer as model species), and K = 5. Dimensions of region: L = 2, M = 4, region is 10 km².