TRB’s National Cooperative Highway Research Program (NCHRP) Web Document 70: Comprehensive Human Factors Guidelines (HFG) for Road Systems examines the recommended content, format, organization, and capabilities of the planned HFG. The report includes an outline of the document and a detailed work plan for development of the first edition of the guidelines. The report also includes a draft Introduction and one sample chapter of the HFG. The HFG is being developed to help facilitate safe roadway design and operational decisions.