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Human Factors Guidelines for Road Systems: Introduction. Why have human factors guidelines for road systems; How to use this document. Part II. Bringing road user capabilities into highway design and traffic engineering practice; Understanding the road user's information-seeking behavior; Integrating road user, highway design, and traffic engineering needs. Part III. Human factors guidance for roadway geometric elements; Sight distance; Curves (horizontal alignment); Grades (vertical alignment); Tangent sections and roadside (cross section); Transition zones between varying road designs; Non-signalized intersections; Signalized intersections; Roundabouts; Interchanges. Part IV. Special design considerations; Speed perception, speed choice, and speed control; Special considerations for urban environments; Complete streets; Special considerations for rural environments; Construction and work zones; Rail-highway grade crossings; Lighting. Part V. Human factors guidance for traffic engineering elements; Signing; Changeable message signs; Markings. Part VI. Human factors guidance for vulnerable and older road users; Pedestrians; Bicyclists; Older road users. Part VII. Additional information; Tutorials
