Car
Many of the roads, especially in the more remote areas of the North West are single track with passing places. Driving there is a pleasure.
Hitchhiking
Hitchhiking is a good way to get around in the Highlands, with up to one in ten cars stopping for hitchhikers, but has two significant downsides. First, the road network is quite sparse in places. Also, many of the country roads that do exist have very low traffic density.