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One primary influence on the safety performance of a Modern Roundabout are the speeds at which vehicles will travel within the facility. This webinar focuses on the analysis tools and method provided by the NCHRP Guideline to evaluate speed, and then looks at how speed-informed design can be accomplished in the TORUS Roundabouts software.

In this webcast you will learn the following:

  • Learn about the five Critical Path Radii, and specifically what Fastest Path is.
  • Understand what speed consistency is and why it is important.
  • Learn about TORUS’ methodology for approximation of fastest path.
  • Watch how TORUS can be used to check fastest path on manually generated roundabout designs, and also how speed-informed geometric design is performed.

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Welcome to your Transoft- ROUNDABOUT FASTEST PATH

1. Which references did Hannah refer to for the fastest path construction methodology?
2. The design speed of the roundabout is defined by the smallest radius along the fastest allowable path.
3. What is R4 in the fastest path methodology?
4. Which set of offsets (from splitter island, central island, and corners) are used in construction of the through fastest path?
5. Why is speed consistency for roundabout design important for designers and engineers?
6. NCHRP Report 672 prescribes that the maximum speed differential between movements should be no more than approximately how many mph?
7. R1<R2<R3 is a condition prescribed in checking speed consistency in a roundabout based on NCHRP 672.
8. You can use the TORUS Roundabout software to evaluate user drawn roundabout designs?
9. What is the maximum number of entry and exit lanes TORUS can currently support?
10. TORUS is able to handle designs with 5 legs.
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