Generate Roundabout

Generate your roundabout geometry based on your design vehicle right from the start.

TORUS generates the initial geometry using the vehicle swept path method – This method minimizes complicated iteration cycles in the design process by providing immediate dimensional and analytical guidance for the ICD, central island diameters, vehicle movements and clearance offsets.

Built-In Design Guidelines

Our Design Guidelines tool controls the design vehicles, clearance offsets, and parameters for the fastest path and sight lines at the start of the roundabout design process.

TORUS supports a multitude of design guidelines and standards:

• NCHRP Report 1043 (supersedes NCHRP Report 672)
• FHWA 2010
• TAC 2017
• Austroads 2018

You can also create new roundabout design guidelines and edit, rename, or delete existing ones.

Design a Variety of Roundabouts

Efficiently design circular and non-circular roundabouts – Elliptical, teardrop, dog-bone, peanut, one lane or multi-lane, to address special constraints such as right of way, utilities and other infrastructure.

Design a turbo roundabout, with its key geometric elements that provides a spiraling flow of traffic, requiring drivers to choose their direction before entering the roundabout.

Outer and Custom Truck Apron

Provide additional traversable area around the central island apron and around the outside entry and exit lanes to allow larger vehicles room to navigate your roundabout without striking fixed objects or other road users.

3D Modeling and Grading

Create a 3D model quickly to ensure that the design intent is confirmed early in the design process by incorporating terrain elevation and the swept paths with its vehicle clearance data together in the project drawing. Issues not anticipated when designing in a 2D plane are now detected and can be resolved using a 3D space, therefore preventing costly damage to vehicles and the roundabout.

Visualize the Impact With Assemblies

Design your complex projects with easy 3D modeling and visualizations, and add assemblies to your roundabout (shoulder, boulevard, sidewalk, curb and gutter). TORUS’ new functionality easily stitches together components such as curbs, truck aprons, sidewalks, splitter islands to generate a realistic 3D roundabout model.

Advanced 3D Grading and Terrain Modeling

Go further with your road design by generating a 3D grading and terrain model to view profiles, super elevation and more. Tie the 3D model back into your existing terrain with ease to see how your design fits with the existing infrastructure and submit your completed design for construction.

Roundabout Footprint Hatch

The roundabout footprint hatch tool improves overall presentation by enhancing the visibility of your designs within drawings. This tool enables you to apply distinct hatching that clearly defines the roundabout area, helping stakeholders quickly grasp design intent and layout. Effectively communicate project details to clients and collaborators, ensuring that every aspect of your roundabout design is easily understood and visually appealing.

Build on Real Traffic Insights

Import existing SIDRA INTERSECTION files directly into TORUS to quickly build your roundabout geometric design based on pre-existing traffic analysis data. This saves time and reduces errors from manual re-entry.

Comprehensive Design and Editing Functions

With its complete set of design and editing tools, you can easily drag and place elements while dynamically updating the design. Simply add and set leg parameters such as entries/exits, offsets, widths, bypass lanes, and curb rounding. Torus updates automatically any analysis already performed.

Instant Conformity Notifications

Streamline your design process with dynamic feedback, making each iteration nearly effortless by simultaneously letting you design and edit the geometry while balancing guidelines, safety, and operation. TORUS provides instant notifications advising you if you’re staying within design guidelines or on any potential design errors and inconsistencies.

Modify Various Elements of Your Geometry

Edit elements of your splitter islands like radii, offsets and more. Extent Splitter islands to facilitate movements in multi-lane designs by directing vehicles into the appropriate circulating roadway lanes. With the Refined Edge tool, draw lines and arcs, which can be fine-tuned to closely represent the final edges of your roundabout.

Crosswalk and Pedestrian Refuge

Introduce pedestrian refuge space to make your design safer for vulnerable road users. Make your roundabout safer and more inclusive by easily placing a crosswalk, adjusting its width and angle in just a few clicks. Align your crosswalk with the edge of the road and change the offset from the yield line to your crosswalk.

Sidewalk Configuration

Complete your roundabout design further by customizing sidewalk and buffer widths to enhance pedestrian safety and accessibility. Easily adapt sidewalk layouts to local standards or specific project needs, prioritize protective zones for pedestrians, and create inclusive roundabout designs that support safe, walkable environments.

Built-in Pavement Marking Tools Built Exclusively for Users with Active GuideSIGN Plus/SIGMA Subscription

Add essential road markings, such as arrows on the inscribed circle, yield lines, dotted entrance lines, and lane-use arrows directly in your roundabout designs to enhance navigation for all road users.

Seamlessly access advanced (full-suite) pavement marking and signage tools from GuideSIGN Plus/SIGMA, elevating your roundabout designs with comprehensive traffic planning solutions.

Fastest Path Evaluation

Ensure your design allows for speed consistency by using the Fastest Path tool to calculate the fastest paths and speeds. TORUS recalculates speeds on every adjustment of the geometric design so you can see the impacts to speed & safety in an instant.

Sight Line Controls and Visibilities Evaluation

To promote driver safety and generate various sight lines that check the angle of visibility or sightlines- approaches to crosswalks, yield lines, circulatory lanes, and more to ensure your design allows enough time and distance for drivers to react to obstacles.

Design Vehicle(s) Accommodation Analysis

Analyze if the roundabout’s dimensions accommodate the largest design vehicle(s) likely to use the roundabout on a regular basis, including the turning path requirements of this vehicle.  Easily add, view, edit, and delete AutoTURN® vehicle movements specified in the current design guidelines, or switch out to a special transport vehicle and check if it can access the roundabout safely.

Path-overlap Analysis for Multi-lane Roundabouts

With TORUS it is easy to simulate vehicle movements within the roundabout by analyzing and displaying the vehicle path overlap. Using TORUS’ Path Overlap Analysis, it detects and analyzes if the natural paths of vehicles in adjacent lanes may overlap. This feature gives you the necessary feedback to highlight this type of vehicle conflict for multi-lane roundabout design.

Traffic Volume Analysis

Add traffic volumes directly in TORUS to perform traffic analysis without leaving the platform. Evaluate how different design choices impact traffic flow and efficiency.

Roundabout Reporting Tables

Create and insert Summary Reports with all design information into the CAD drawing or export it to csv or text format files. Create and insert the Fastest Path Analysis, Curve Tables, Turning Movement Reports and Summary Reports with all design information to finish your design.

Fastest Path Results and Curve Table

Fastest Path Results Table contains radius and speed data on the roundabout. Curve Table consists of a curve table and a line table for the data on the roundabout’s refined edges.

Design Manager

Reduce your iteration cycle and use the Design Manager to create, track and explore more roundabout design options. TORUS allows you to save, recall, and display multiple roundabout iterations for review and comparison.

Traffic Data Reporting

Generate traffic data reports directly in TORUS to assess the roundabout design performance with comprehensive insights that help you make data-driven decisions faster.

Capacity File Export to SIDRA

Export TORUS capacity reports back to SIDRA INTERSECTION as SIDRA INTERSECTION project files for further refinement, keeping your workflow flexible while maintaining accuracy and consistency.