Recent updates on unconventional designs

Quadrant Roadway Intersection:

• Quadrant roadway intersection informational guide (January, 2020)

Continuous Green T Intersections:

• Safety Evaluation of Continuous Green T Intersection (November, 2019)

Roundabouts:

• Advancing Turbo Roundabouts in the United Sates: Synthesis Report (September, 2019)
• Turbo Roundabout (September, 2019)
• Accelerating Roundabout Implementation in the United States (Updated July, 2020):
  • Volume I- Evaluation of Rectangular Rapid-Flashing Beacons (RRFB) at Multilane Roundabouts-Final Report
  • Volume II- Assessment of Roundabout Capacity Models for the Highway Capacity Manual- Final Report
  • Volume III- Assessment of the Environmental Characteristics of Roundabouts- Final Report
  • Volume IV- Review of Fatal and Severe Injury Crashes at Roundabouts- Final Report
  • Volume V- Evaluation of Geometric Parameters that Affect Truck Maneuvering and Stability- Final Report
  • Volume VI- investigation of Crosswalk Design and Driver Behaviors- Final Report
  • Volume VII- Human Factor Assessment of Traffic Control Devices Effectiveness-Final Report
• Roundabout Practice (NCHRP Synthesis 484) (2016)
• Estimating the life-cycle cost of intersection design (NCHRP Web-Only Document220) (2016)
• Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities: A Guidebook (2017)
• A Study of the Traffic Safety at Roundabouts in Minnesota (2017)
• Evaluation of safety and mobility of two-lane roundabouts: final report. (July, 2017)
• Strategies for effective roundabout approach speed reduction: final report. (May, 2017)

Reduced Left-turn Conflict Intersections (RCUT, MUT)

• Reduced Left–Turn Conflict Intersections Summary
• Safety Evaluation of Signalized Restricted Crossing U–Turn Intersections Tech Brief
• A Study of the Traffic Safety at Reduced Conflict Intersections in Minnesota
• Driving simulator study of J-turn acceleration / deceleration lane and U-turn spacing configurations (Missouri Department of Transportation, Midwest Transportation Center, United States Department of Transportation, December 2016)
• System-wide safety treatments and design guidance for J-turns (Missouri Department of Transportation, Midwest Transportation Center, United States Department of Transportation, December 2016)
• System-wide safety treatments and design guidance for J-turns (Missouri Department of Transportation, Midwest Transportation Center, United States Department of Transportation, December 2016)
• Case Studies:

Restricted Crossing U-Turn

• U.S. Route 15 Corridor, Frederick County, MD
  • State Route 55 Bypass, Holly Springs, NC
  • U.S. Route 17 Corridor, Wilmington/Leland, NC
  • North Carolina’s Experience with Restricted Crossing U–Turn Superstreets

J-Turn: Minnesota’s First Restricted Crossing U–Turn Intersections (J–Turns)

Median U-Turn:

• Michigan Avenue at South Harrison Road, East Lansing, MI
  • Woodward Avenue at East Maple Road, Birmingham, MI PDF
  • Statewide Corridor Applications, State of Michigan

Contraflow Left

• Recurring Traffic Bottlenecks: Emerging Bottleneck Treatments
• Simulator Assessment of Contraflow Lanes at Signalized Intersections

DDI

• Drivers’ Evaluation of the Diverging Diamond Interchange