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TRB’s National Cooperative Highway Research Program (NCHRP) Report 600: Human Factors Guidelines for Road Systems: Second Edition provides data and insights of the extent to which road users’ needs, capabilities, and limitations are influenced by the effects of age, visual demands, cognition, and influence of expectancies.

NCHRP Report 600 provides guidance for roadway location elements and traffic engineering elements. The report also provides tutorials on special design topics, an index, and a glossary of technical terms.

The second edition of NCHRP 600 completes and updates the first edition, which was published previously in three collections.

Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2012. Human Factors Guidelines for Road Systems: Second Edition. Washington, DC: The National Academies Press. https://doi.org/10.17226/22706.

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Publication Info

31 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/22706
Chapters skim
Front Matter i-x
Part I - Introduction 1-3
Chapter 2 - How to Use This Document 4-8
Part II - Bringing Road User Capabilities into Highway Design and Traffic Engineering Practice 9-9
Chapter 3 - Finding Information Like a Road User 10-19
Chapter 4 - Integrating Road User, Highway Design, and Traffic Engineering Needs 20-25
Part III - Human Factors Guidance for Roadway Location Elements 26-26
Chapter 5 - Sight Distance Guidelines 27-45
Chapter 6 - Curves (Horizontal Alignment) 46-58
Chapter 7 - Grades (Vertical Alignment) 59-65
Chapter 8 - Tangent Sections and Roadside (Cross Section) 66-70
Chapter 9 - Transition Zones Between Varying Road Designs 71-73
Chapter 10 - Non-Signalized Intersections 74-84
Chapter 11 - Signalized Intersections 85-93
Chapter 12 - Interchanges 94-106
Chapter 13 - Construction and Work Zones 107-119
Chapter 14 - Rail-Highway Grade Crossings 120-132
Chapter 15 - Special Considerations for Urban Environments 133-143
Chapter 16 - Special Considerations for Rural Environments 144-152
Chapter 17 - Speed Perception, Speed Choice, and Speed Control 153-167
Part IV - Human Factors Guidance for Traffic Engineering Elements 168-168
Chapter 18 - Signing 169-179
Chapter 19 - Changeable Message Signs 180-194
Chapter 20 - Markings 195-205
Chapter 21 - Lighting 206-218
Part V - Additional Information 219-219
Chapter 22 - Tutorials 220-267
Chapter 23 - References 268-285
Chapter 24 - Glossary 286-294
Chapter 25 - Index 295-298
Chapter 26 - Abbreviations 299-301
Chapter 27 - Equations 302-307

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