A Performance-Based Highway Geometric Design Process (2016) / Chapter Skim
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Pages 181-191
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181 8.1 AASHTO Curve Model The current AASHTO model for design of horizontal curves does not produce cost-effective solutions across the range of project types and contexts. As horizontal alignment is among the most influential elements of road design, a revisiting of the AASHTO curve model with potential for developing a more robust and science-based approach is a high research priority.
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182 a performance-Based highway Geometric Design process The DSD for a stopping maneuver uses the same model but varies the perception/reaction time based on the context. In urban areas where there is more distraction the time is longer.
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research and Knowledge Needs to Fully Implement the revised process 183 fundamental disagreement over the need to change ("the original way is working fine")
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184 a performance-Based highway Geometric Design process challenges and barriers for any process change. Depending on the final process recommendation, there may be unique challenges and barriers that will be further identified and addressed at that time.
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research and Knowledge Needs to Fully Implement the revised process 185 • The transition process will also be a challenge for most agencies. Needs regarding training, documentation, and process quality control will have to be addressed before the first project can be developed using the revised process.
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186 a performance-Based highway Geometric Design process revised geometric design process due to either a lack of available information, technical expertise, or access to new software. However, AASHTO already publishes a design policy for very low-volume rural local roads.
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research and Knowledge Needs to Fully Implement the revised process 187 agency's investment. Several examples that may fit this category, depending on a state's design approach, include: • Designing long turn lane lengths in constrained environments, especially if volumes are low enough to allow the intersection to operate properly with shorter turn lanes.
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188 a performance-Based highway Geometric Design process DOTs. This is a top-down approach to building support within the industry, but the advantage of an executive sponsor is its ability to make clear the importance of the transition.
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research and Knowledge Needs to Fully Implement the revised process 189 The Green Book is updated about every 7 to 10 years. It evolved from a single policy document, to two documents encompassing separately rural and urban road design.
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190 a performance-Based highway Geometric Design process Part III -- Geometric Design Process for Roads to Be Reconstructed Chapter 19 -- Reconstruction Design Process Overview Chapter 20 -- Reconstructed Local and Collector Roads in Rural Context Zones Chapter 21 -- Reconstructed Arterial Roads in Rural Context Zones Chapter 22 -- Reconstructed Freeways and Controlled Access Facilities in Rural Context Zones Chapter 23 -- Reconstructed Local and Collector Roads in Suburban Context Zones Chapter 24 -- Reconstructed Arterial Roads in Suburban Context Zones Chapter 25 -- Reconstructed Freeways and Controlled Access Facilities in Suburban Context Zones Chapter 26 -- Reconstructed Local and Collector Roads in Urban Context Zones Chapter 27 -- Reconstructed Arterial Roads in Urban Context Zones Chapter 28 -- Reconstructed Freeways and Controlled Access Facilities in Urban Context Zones Part IV -- Roads Requiring Resurfacing, Restoration, or Rehabilitation (3R) Chapter 29 -- 3R Design Process for All Road Types and Contexts 8.6 Implications with Driverless/Connected/ Autonomous Technology Advances in vehicle technology are accelerating.
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research and Knowledge Needs to Fully Implement the revised process 191 • Societal and cultural issues need resolution. Specifically, does the presence of fully autonomous technology absolve a driver from any and all responsibility?
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