Four-wheel drive (4WD) vehicles provide t main means of access to the dry and sparsely settled sandy coastlines of Western Australia for ecotourists and other visitors alike. This has cre- ated an extensive network of tracks through dune and foreshore vegetation. Most previous studies of 4WD vehicle impacts have focused on local-scale impacts (Anders and Leather man, 1987; Lonsdale and Lane, 1994; Kutiel et al, 2000). In areas such as these dry sandy foastlines, however, the local impacts