This new AASHTO Guide shows highway designers how to think flexibly, how to recognize the many choices and options they have, and how to arrive at the best solution for the particular situation or context. It also strives to emphasize that flexible design does not necessarily entail a fundamentally new design process, but that it can be integrated into the existing transportation culture. This publication represents a major step toward institutionalizing CSS into State transportation departments and other agencies charged with transportation project development.

This new AASHTO Guide shows highway designers how to think flexibly, how to recognize the many choices and options they have, and how to arrive at the best solution for the particular situation or context. It also strives to emphasize that flexible design does not necessarily entail a fundamentally new design process, but that it can be integrated into the existing transportation culture. The four chapters of this bridging document represent a major step toward institutionalizing CSS into State transportation departments and other agencies charged with transportation project development.

Selected sections from A Guide for Achieving Flexibility in Highway Design, 2004, by the American Association of State Highway and Transportation Officials, Washington, D.C. are used by permission on this site. AASHTO publications may be purchased from that organization's bookstore at 1-800-231-3475 or online at http://bookstore.transportation.org.

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• Access Control: Flexibility in the AASHTO Guidelines
• Bridges: Flexibility in the AASHTO Guidelines
• Decision Sight Distance (DSD): Flexibility in the AASHTO Guidelines
• Decision Sight Distance (DSD): Mitigating Insufficient Decision Sight Distance
• Horizontal Alignment: Flexibility in the AASHTO Guidelines
• Horizontal Alignment: Mitigating Tight Curvature
• Intersections: Flexibility in the AASHTO Guidelines
• Intersection Sight Distance (ISD): Flexibility in the AASHTO Guidelines
• Intersection Sight Distance (ISD): Mitigating Limited Intersection Sight Distance
• Intersections: Mitigating Nontraditional Intersection Design Treatments
• Lane Width: Flexibility in the AASHTO Guidelines
• Lane Width: Mitigating Narrow Lanes
• Medians: Flexibility in the AASHTO Guidelines
• Medians: Mitigating the Effects of Narrow Medians
• Passing Sight Distance (PSD): Flexibility in the AASHTO Guidelines
• Passing Sight Distance (PSD): Mitigating Limited Passing Sight Distance
• Pedestrian and Bicycle Facilities: Flexibility in the AASHTO Guidelines
• Roadside Clear Zone: Flexibility in the AASHTO Guidelines
• Shoulder Width: Flexibility in the AASHTO Guidelines
• Shoulder Width: Mitigating Narrow Shoulder Widths
• Stopping Sight Distance (SSD): Flexibility in AASHTO Guidelines
• Stopping Sight Distance (SSD): Mitigating Limited Stopping Sight Distance
• The Roadside: Flexibility in the AASHTO Guidelines
• Vertical Alignment (Grades): Flexibility in AASHTO Guidelines
• Vertical Alignment (Grades): Mitigating Steep Grades