Two types of highways are covered in this chapter: multi-lane (two or more lanes in each direction) and two-lane highways (one lane in each direction). Multi-lane highway segments are analyzed similarly to basic freeway segments. In some instances, multi-lane highways are like freeway segments or arterials, based on the access density and speed.

For two-lane highways, vehicles pass using the opposing lane of traffic. Two-lane highways can include intercity connectors, regional connectors, intracity connectors and may pass through scenic areas or areas with challenging terrain.