1 / 11

Roundabout Level of Service and Delay and Comparison to Other Intersection Types

Roundabout Level of Service and Delay and Comparison to Other Intersection Types. Erik Ruehr, VRPA Technologies, Inc. ITE Western District Annual Meeting June 26, 2012. Sample Roundabout. Photo: Casey Bergh. Outline. Introduction History of Roundabout Capacity Analysis Tools

tamar
Download Presentation

Roundabout Level of Service and Delay and Comparison to Other Intersection Types

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Roundabout Level of Service and Delay and Comparison to Other Intersection Types Erik Ruehr, VRPA Technologies, Inc. ITE Western District Annual Meeting June 26, 2012

  2. Sample Roundabout Photo: Casey Bergh

  3. Outline Introduction History of Roundabout Capacity Analysis Tools 2010 HCM Roundabout Procedure Level of Service Versus Delay Tables Implications for Comparisons to Other Intersection Types Non-Yielding Right Turn Bypasses Conclusion

  4. Introduction TYPES OF AT-GRADE INTERSECTIONS All-Way Stop Control Two-Way Stop Control Traffic Signal Roundabout

  5. History of Roundabout Capacity Analysis Tools 2000 Highway Capacity Manual: Initial Guidance 2010 Highway Capacity Manual: Full Procedure Sidra Rodel Traffic Simulation

  6. 2010 HCM Roundabout Procedure Incorporates NCHRP Report 572 Methodologies (with Enhancements and Extensions) Lane-by-lane Analysis of Single-lane and Multi-lane Roundabouts Produces Level of Service and Delay Results

  7. Level of Service Versus Delay Tables Two-Way Stop / All-Way Stop < Traffic Signal < > 10 - 20 > 20 - 35 > 35 - 55 > 55 - 80 >80

  8. Level of Service Versus Delay Tables Two-Way Stop / All-Way Stop / Roundabout < Traffic Signal < > 10 - 20 > 20 - 35 > 35 - 55 > 55 - 80 >80

  9. Implications for Comparisons to Other Intersection Types • Two-Way Stop • Major Street Through/Right Movements Have Zero Delay • All-Way Stop • Similar to Roundabout • Traffic Signal • Comparable Based on Level of Service Per 2010 HCM Definitions • Be Aware of Differences in Delay Versus Level of Service Tables • Non-Yielding Bypass Lanes and Free Right Turn Lane Comparisons

  10. Non-Yielding Right Turn Bypasses and Free Right Turns Free Right Turn Lane Non-Yielding Right Turn Bypass (Included in Overall Intersection Delay Calculation) (Not Included in Overall Intersection Delay Calculation)

  11. Conclusion 2010 Highway Capacity Manual Includes Complete Procedure for Roundabouts Comparisons of Roundabouts to Other Intersections Can Be Complicated Comparisons Based on Level of Service Are More Consistent Than Comparisons Based on Delay

More Related