The processes that creates gneiss can recreate normal granite if carried on long enough, and gneiss can also form from gabbro or shale. Schist and quartzite may be formed alongside gneiss, along with other types of metamorphic rock formed from igneous rocks. Gneiss is very common and actually forms the majority of the Earth's lower crust, so any deep tunneling encounters gneiss.
Inventoried roadless area. Inventoried Roadless Areas are a group of United States Forest Service lands that have been identified by government reviews as lands without existing roads that could be suitable for roadless area conservation as wilderness or other non-standard protections.
A highway is a major road, paved, and most of the time maintained by federal or local governments. Basically your normal main roads. A freeway/expressway (I believe they are fairly interchangeable) is a major road usually with more than 2 lanes on each side and is free for most passenger cars and light trucks. Some charge a fee for trucks or enforce a lower speed limit for trucks over a certain weight or axle count.