Geometric Design & Layout Development
Example Layouts & Profiles
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This page provides examples of past layouts and profiles that have been submitted to and approved by the State Geometric Engineer and State Design Engineer. These examples are a good reference in developing the format and content of products being worked on for future review and approval.

 

Level 1 Urban Interchange (PDF, 1.8MB)

Level 1 Single Point Diamond Interchange (PDF, 1.5MB)

Level 1 Single Point Diamond Rural Interchange (PDF, 4.1MB)

Level 1 Rural Interchange (PDF, 1.2MB)

Level 2 Layout & Profile (PDF, 1.2MB)

Roundabout (PDF, 2.2MB)

Level 1 Layout Portion/Flap (PDF, 2.5MB)

 

Importance of Creativity:

Keeping creative should be an ongoing process and layout development should occur through the iterative process of developing alternatives and gathering input. The development of alternatives can not be stressed enough as talk is good, but a picture is worth a thousand words. Some of the unusual and seemingly poor choices sometimes are best drawn to exhibit their value. Evaluation of these alternatives is best done by a large group of personnel representing a diverse background. As such, networking with your design forces is important in providing the best design solution. Peer review is an ideal way to accomplish quality assurance and pays dividends while also sharing ideas and experiences. As emphasized by AASHTO, multi-disciplinary design efforts must remain operative until the final plans are developed and the design process should be an evolution. Layout changes are just part of the design efforts which could be considered questionable if a number of alternates are not studied prior to the final layout.

 

The layout process may appear formal, however, it is important to stay creative not only in content as described previously, but also in appearance and drafting. Like any creative process, all layouts need not take on a standard appearance, but only present similar content to the audience. The final layout should take on a more polished appearance as it is viewed and evaluated not just by the highway community, but by the general public and their elected representatives who may be unfamiliar with plans and technical drawings. This is why the layout appears the way it does as it is a unique story that represents proposed designs using special colors, notes, dimensions, labels, arrows, traffic volume tables, legends, and insets. The layout work often becomes a sales tool for the Project Manager to show acceptable design and related impacts. The Final Layout is retained as part of the project record and is a useful picture for use before, during, and after construction.

 

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