This report completes and updates the first edition of NCHRP Report 600: Human Factors Guidelines for Road Systems (HFG), which was published previously in three collections.
The HFG contains guidelines that provide human factors principles and findings for consideration by, and is a resource document for, highway designers, traffic engineers, and
other safety practitioners. Each of the design guidelines in the HFG is presented using a consistent, highly structured format that is intended to maximize ease-of-use and interpretability. The guidelines focus on providing specific, actionable design principles, supported by a discussion and review of key research and analyses. Special design issues and considerations are included to help address design constraints and relevant trade-offs.