highwayclass
The term "highwayclass" is not a standard or widely recognized term in transportation engineering, road design, or general discourse. It is possible that "highwayclass" is a proprietary term used by a specific organization, a project-specific designation, or a misspelling of a related concept. Without further context, it is difficult to provide a definitive explanation.
However, if "highwayclass" is intended to refer to a classification system for highways, such systems do exist