The serial killer you probably haven't heard of | the Oregon Highway 20 murders

From the late 1970s through to the early 90s, there were a number of of victims, all young women, who disappeared along the same highway, running through Oregon in the US. It was highway 20, connecting the whole state, from west to east and running through the Cascade Mountains. It runs through cities and some of the most remote areas of the state; there are plenty of areas in which someone could run into trouble. Several stretches of the highway runs through thick, thick forest, so heavily wooded that you can walk into it and immediately find yourself lost and disorientated. Any body hidden in there would be near-on impossible to find.