Cold recycling road pavement materials into new road construction is a cost-effective and sustainable practice. However, the properties of these materials must be characterized to adequately design pavement structures. This project developed a framework and tool for transportation agencies to estimate the key material properties of cold recycled materials incorporated into road designs.
Continue reading Assessing Recycled Pavement for Use in Road DesignTag Archives: road design
New Project: Roadside Feature Placement and Pedestrian Safety on Low and Intermediate Speed Roads
Guidelines for designing and placing roadside features have traditionally focused on automobile safety on higher-speed roads. Research has also shown feature placement can have safety benefits for pedestrians and bicyclists on lower-speed roads.
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Measuring the Effects of Road Features on Driving Speeds
The Complete Streets approach to roadway design uses site characteristics to create a safer, more accessible environment for all road users. New research demonstrates that roadway design features have a measurable impact on driving speeds. The development of speed reduction factors (SRFs) that estimate the impact of road features on speed reduction provides a data-driven approach to highway design.
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Design Standards for Unobstructed Sight Lines at Left-Turn Lanes
Positive offset left-turn lanes are one solution to improving left-turning motorists’ visibility of opposing through and right-turning traffic.
MnDOT is revising its Road Design Manual and seeks to incorporate more information, policies and design guidance regarding positive offset left-turn lanes.
Researchers from the University of Wisconsin’s Traffic Operations and Safety Laboratory reviewed safety performance data from research that examined left-turn offsets. They also consulted 23 state DOT road design guides to understand the extent of available guidance.
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