
Presentation | 2013
Restricted Crossing U-Turn (RCUT) Intersection Safety Analysis
- Authored by: Chris Cunningham
- Event: 2012 National Conference on Access Management
Restricted Crossing U-Turn (RCUT) Intersection Safety Analysis The North Carolina Experience
North Carolina State University
AM1207Cunningham
Objectives
Determine the safety and operational benefits of superstreets for NC motorists
Fulfill the need for capacity and level of service methodology
Slide Titles
Restricted Crossing U-Turns (RCUT) Benefits and Capacities (Project 2009-06)
Project Team
Objectives
Superstreet Description
Operational Analysis Overview
Saturation Flow Study
Site Selection Signalized Superstreets
Model Calibration/Validation Process
Superstreet vs. Conventional: Experiment Setup
Superstreet vs. Conventional: Results
Superstreet vs. Conventional: Results
Operational Conclusions
Safety Analysis Overview
Site Selection
Data Collection
Data Collection
Calibration Factors
Naïve Analysis
Naïve Analysis – Results
C-G Analysis
C-G Analysis – Results
EB Naïve Analysis
All Methods Comparison
Safety Conclusions
Resident Survey
Resident Survey Results
Commuter Survey
Commuter Survey – Results
Commuter Survey Conclusion
Business Owner Survey
Business Owner Survey – Conclusions
NCLOS
NCLOS Superstreet
NCLOS Superstreet, cont.
NCLOS Superstreet, cont.
NCLOS Superstreet Defaults
NCLOS Roadway Factors
NCLOS Traffic Factors
Implementation Recommendations
Safety Conclusions
Unsignalized superstreets:
o Reduced collisions for total, angle and right turn, left turn, and fatal and injury
o Total collisions reduced by 46% (C-G method)
o C-G method recommended for NC superstreets
Signalized superstreets:
o Results inconclusive
o 3 sites with unique characteristics
Implementation Recommendations
Consider superstreets for upgrading arterials similar to those in this study
o High volume, divided arterial
o Low volume minor road
Better as a corridor than isolated intersection
Better when built along developing corridors
Evaluate the possibility for left turn on red