TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 296: Comprehensive Human Factors Guidelines (HFG) for Road Systems summarizes NCHRP Web Document 70 of the same title that examines the recommended content, format, organization, and capabilities of the planned HFG. Web Document 70 includes an outline of the HFG and a detailed work plan for development of the first edition of the guidelines. The web document 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.