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Transoft Releases TORUS 5.1 for Mini-Roundabout Design

Transoft Releases TORUS 5.1 for Mini-Roundabout Design
0 comments, 08/09/2017, by , in AEC, News

VANCOUVER, BC, Canada, Sep 8, 2017 - Transoft Solutions Inc., developers of transportation engineering design software, has announced the release of TORUS 5.1, the industry-leading software for designing roundabout intersections. Building on proven technology contained in previous versions of TORUS, TORUS 5.1 has enhanced features that give traffic planners and engineers the ability to construct mini-roundabouts in residential areas. First developed in the United Kingdom as a lower-cost alternative to regular roundabouts, mini-roundabouts are gaining popularity in North America and elsewhere. They feature a single lane with a fully mountable central island and splitter islands, which allow larger vehicles to pass over them – unlike traditional, multi-lane roundabouts whose traffic islands are usually landscaped and must be driven around, not over. Benefits of mini-roundabouts include:

  • A smaller design footprint, meaning designers need less right of way
  • Shorter construction time
  • Less expensive to build and maintain
  • Improved traffic flow
  • Safer for pedestrians and cyclists
  • More flexible to replace existing residential intersections


Seeing mini-roundabouts as a growing trend in roundabout design, Transoft decided to include them as the key added feature of the new TORUS 5.1 software. “Right now in the United States a lot of counties and cities are going with these types of roundabouts in residential areas,” said Hannah Khosravi, civil designer at Transoft Solutions. “For the next two to three years they should be a hot topic by engineers and designers.” The new version of TORUS includes the Stockdale method of roundabout grading, whereby grading of slopes for water dispersal can be applied from inside to outside, and vice versa, for the central island, truck apron and Inscribed Circle Diameter (ICD). Previous TORUS versions could only apply slope grading from the inside to the outside of the roundabout. TORUS 5.1 also supports new design guidelines, including:

  • NCHRP 672
  • TAC 2017- Canadian Roundabout Design Guide
  • Mini- Roundabouts ( FHWA, NCHRP 672 and TAC 2017)


TORUS 5.1 is compatible with AutoCAD 2018. Powered by AutoTURN, Transoft’s flagship software used by most North American departments of transportation, TORUS uses the Vehicle Envelope Method (U.S. Patent No. 8,650,004) to generate roundabout geometry with vehicle swept paths – which refer to the paths vehicles take as they turn. This innovative approach allows for real-time, interactive designing and dynamically updates any changes made to the entire roundabout layout, thus eliminating the need to re-draw and re-calculate. TORUS minimises the number of iterations in a design, while at the same time, incorporates speed, the design vehicle and sight distance checks. Dynamic editing features, sight lines and immediate feedback on fastest path – the fastest a passenger vehicle can travel through the roundabout – give transportation specialists the ability to create optimal roundabout designs much more efficiently and reliably.

About Transoft Solutions

Transoft Solutions, Inc. develops innovative and easy to use software for transportation professionals. Since 1991, civil engineers and technologists, architects, and city planners across federal agencies, State DOTs, airport authorities, cities, ports, and infrastructure consultants have come to rely on Transoft’s field-researched design solutions. Transoft engineers work closely with the world’s leading agencies including AASHTO, ITE, TRB, TAC, Austroads, and CROW to develop highly specialised applications serving over 30,000 users across 120 countries. Transoft Solutions is committed to providing best-in-class customer support through its offices in Canada, Sweden, The Netherlands, Australia, Germany and India, enabling professionals to design with confidence. For more information, visit http://www.transoftsolutions.com.

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