Safety-Based Volume Warrants for Right-Turn Lanes at Unsignalized Intersections and Driveways on Two-Lane Roadways

AbstractSafety-based volume warrants for right-turn lanes (RTLs) at uncontrolled major-road approaches to intersections and driveways on two-lane roadways were developed based on traffic crash and conflict analyses. Crash analysis was carried out based on statewide historical data of traffic crashes reported on Minnesota’s two-lane trunk highways. Conflict analysis was carried out using field data and twelve individual VISSIM models involving 350 scenarios to simulate the conflicts caused by right turns for a wide range of conditions. Each scenario involved twenty simulation runs, and each run used a different random seed. Model calibrations involved replication of spot-speed and time-headway distributions observed at field, whereas the model validations involved comparisons between simulated and observed conflicts. Crash-conflict relationships were developed in terms of crash-conflict ratios (CCRs) and crash estimation factors (CEFs). The estimated mean CCRs were 1.413×10−6 and 0.496×10−6 at approaches w...

[1]  Patrick T McCoy,et al.  GUIDELINES FOR RIGHT-TURN LANES ON URBAN HIGHWAYS. FINAL REPORT , 1993 .

[2]  Fred L. Mannering,et al.  Negative binomial analysis of intersection accident frequencies , 1996 .

[3]  Cottrell.  THE DEVELOPMENT OF CRITERIA FOR THE TREATMENT OF RIGHT TURN MOVEMENTS ON RURAL ROADS , 1981 .

[4]  Kay Fitzpatrick,et al.  Operation and Safety of Right-Turn Lane Designs , 2006 .

[5]  Nabeel K Salman,et al.  SAFETY EVALUATION AT THREE-LEG, UNSIGNALIZED INTERSECTIONS BY TRAFFIC CONFLICT TECHNIQUE , 1995 .

[6]  Jeffery Archer,et al.  Indicators for traffic safety assessment and prediction and their application in micro-simulation modelling : a study of urban and suburban intersections , 2005 .

[7]  W. D. Glauz,et al.  EXPECTED TRAFFIC CONFLICT RATES AND THEIR USE IN PREDICTING ACCIDENTS , 1985 .

[8]  Ezra Hauer,et al.  PREDICTION OF THE EXPECTED SAFETY PERFORMANCE OF RURAL TWO-LANE HIGHWAYS , 2000 .

[9]  N. M. Katamine.  Nature and frequency of secondary conflicts at unsignalized intersections , 2000 .

[10]  Darren J Torbic,et al.  GUIDANCE FOR IMPLEMENTATION OF THE AASHTO STRATEGIC HIGHWAY SAFETY PLAN. VOLUME 5: A GUIDE FOR ADDRESSING UNSIGNALIZED INTERSECTION COLLISIONS , 2003 .

[11]  Jidong Yang.  Risk-Based Volume Warrants for Free Right-Turn Lanes on Two-Lane Roadways , 2008 .

[12]  Patrick T McCoy,et al.  Volume Warrant for Free Right-Turn Lanes at Unsignalized Intersections on Rural Two-Lane Highways , 1996 .

[13]  Elizabeth C Crowe.  TRAFFIC CONFLICT VALUES FOR THREE-LEG, UNSIGNALIZED INTERSECTIONS , 1990 .

[14]  Amiy Varma,et al.  Safety Impacts of Right-Turn Lanes at Unsignalized Intersections and Driveways on Two-Lane Roadways: Crash Analysis , 2014 .

[15]  D Solomon,et al.  Accidents on main rural highways related to speed, driver, and vehicle , 1964 .

[16]  Simon Washington,et al.  Modeling crash types: New insights into the effects of covariates on crashes at rural intersections , 2006 .

[17]  Hoong Chor Chin,et al.  Measurement of traffic conflicts , 1997 .

[18]  Martin R Parker,et al.  TRAFFIC CONFLICT TECHNIQUES FOR SAFETY AND OPERATIONS. OBSERVERS MANUAL , 1989 .

[19]  Martin R Parker,et al.  Traffic conflict techniques for safety and operations: engineers guide , 1989 .

[20]  Mohammed Hadi,et al.  Speed Differential as a Measure to Evaluate the Need for Right-Turn Deceleration Lanes at Unsignalized Intersections , 2003 .

[21]  J. Bared,et al.  Accident Models for Two-Lane Rural Segments and Intersections , 1998 .

[22]  T R Neuman.  Intersection Channelization Design Guide , 1985 .

[23]  Lily Elefteriadou,et al.  Safety Effectiveness of Intersection Left- and Right-Turn Lanes , 2003 .

[24]  Tarek Sayed,et al.  Surrogate Safety Assessment Model and Validation: Final Report , 2008 .

[25]  Michael C. Pietrzyk,et al.  Development of Expected Conflict Value Tables for Unsignalized Three-Legged Intersections , 1998 .

[26]  Raffaele Mauro,et al.  Model to Evaluate Potential Accident Rate at Roundabouts , 2004 .

[27]  W D Glauz,et al.  APPLICATION OF TRAFFIC CONFLICT ANALYSIS AT INTERSECTIONS , 1980 .

[28]  H S Levinson,et al.  IMPACTS OF ACCESS MANAGEMENT TECHNIQUES , 1999 .

[29]  H C Joksch,et al.  A BRIDGING ANALYSIS FOR ESTIMATING THE BENEFITS OF ACTIVE SAFETY TECHNOLOGIES , 1996 .