NEXUS DDIPlan, Design, And Evaluate Diverging Diamond Interchange Geometries

A well-designed Diverging Diamond Interchange has the potential to improve safety and reduce traffic delays more effectively and at a lower cost than a traditional interchange. DDI designers, however, are faced with the challenge of balancing competing factors, such as the footprint, geometry, safety, design vehicle accommodation and cost. This has traditionally been a manual, time-consuming and often tedious process. NEXUS DDI is a CAD-based tool that enables designers to quickly generate DDI geometries based on site-specific constraints, design guidelines, lane configuration, design speed and vehicles. With dynamic editing capabilities, the software provides real-time feedback of geometric parameters. Valuable design and drafting time will be saved by reducing the need for manual design methods and calculations during the DDI project’s proposal, conceptual and preliminary design stage.

With NEXUS DDI’s intuitive geometric design workflow, even less experienced designers will become confident while gaining the vital knowledge required to take on complex DDI design projects.


Take the complicated calculations out of the equation

AutoTURN does the math for you. Eliminate the challenges of calculating curves and modeling vehicles with different steering capabilities. Using a vehicle of your choice, AutoTURN will compute the space requirements and show you the results, so you can focus on the important safety and operational components of your design.

Boost productivity and explore the best design options

Save time and make better decisions. Quickly create simulations and check multiple maneuvers for all vehicles accessing the site. Smart tools and automated processes help increase productivity and reduce human errors. Great for discovering the best design option or modeling more complex scenarios such as traffic calming and site circulation analysis.

Tackle complex urban design and complete streets projects

Embrace the future of urban design. With AutoTURN Pro, you can simulate the movement and turning requirements of a variety of bicycle types to validate your design is safe for cyclists, pedestrians and motorists alike..

Test your design with a vast array of vehicles

AutoTURN Pro includes over 1300 vehicles in its manufacturer-specific and standard design vehicle libraries, so you can run a robust swept path analysis. Quickly search by library name and apply filters to define results. You can also set custom vehicle groups that match your country or local area design.

Visualize the impact in 3D

Run 3D simulations to check for potential conflicts with terrain and infrastructure or for presentation purposes. With AutoTURN Pro you can also easily illustrate, vehicle paths maneuvering forward and backward..

Review your results with quality diagnostic tools

The automated tools ensure your design aligns with the guidelines and safety requirements of local transportation agencies. You can also readily check any manually produced simulations to ensure key parameters meet design criteria. Produce detailed reports so that reviews can be done by peers or others—meaning you can get a quicker stamp of approval on your design..



Visualize the effect of the design vehicle movements on the DDI geometry. The software uses the proprietary AutoTURN vehicle movement algorithm.


Check eyebrow and median geometries to ensure that their location and shape discourage wrong-way vehicle movements.


Change the design element values in the guidelines or directly use grip points to quickly edit crossover angles and, locations or rotate the crossovers entirely. .


The number of lanes and the lane assignments, which are typically generated through traffic operational analysis, can be graphically defined and adjusted.

Platform Compatibility


Minimum AutoTURN Pro 10.2 (sold separately) installed on the same workstationAutodesk® AutoCAD® 2015 – 2019 (except AutoCAD LT)
Autodesk® Civil 3D® 2015 – 2019 Bentley® MicroStation® V8i, CONNECT®

System Requirements:

Full support for 32 and 64-bit operating systems
Workstation: Windows® 7, Windows® 8/8.1, Windows® 10
Network: Windows® Server 2008, 2012, 2016

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