Synthesis of Safety for Traffic Operations - Transports Canada

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Synthesis of Safety for Traffic Operations March 2003 Researcher Treatment Study Methodology No. Sites CMF Comments 14 0.64 Left-turn crashes from 2WLTL Left-turn crashes Naïve before-after 13 0.78 Yagar and Van Aerde to 2WLTL Provision of a 2WLTL study of crash (1984) Left-turn crashes frequency 18 0.64 to and from 2WLTL Lalani (1991) Tople (1998) Brown and Tarko (1999) Bauer and Harwood (2000) Provision of a 2WLTL Restriping to provide a 2WLTL Reconstructing to provide a 2WLTL Provision of a 2WLTL Provision of a right-turn lane Naïve before-after study of crash frequency Naïve before-after study of crash frequency Naïve before-after study of crash frequency Cross-sectional study using EB methods Cross-sectional study using EB methods 21 0.72 All crashes 5 0.42 3 5 155 0.91 0.77 0.92 1.40 0.50 0.42 0.47 --- 0.85 --- 1.12 All crashes EPDO crashes All crashes EPDO crashes Casualty crashes PDO crashes All crashes Rural, 4-leg, stop controlled Urban, 4-leg, signalized, channelized on main road Page 167
Synthesis of Safety for Traffic Operations March 2003 Researcher Treatment Study Methodology No. Sites CMF Comments Harwood et al (2000) Chin and Quddus (2001) Harwood et al (2002) * 90% Confidence intervals Provision of a left-turn lane on the main road Provision of right-turn lane on rural two-lane roads Provision of turn lanes on approaches to signalized intersections Provision of right-turn lane on major street Provision of right-turn lanes on both major street approaches Expert opinion from a review of several studies Cross-sectional study using EB methods Before-after study using EB methods --- --- --- --- --- 1.75 (rural) 1.47 (urban) 0.81 (rural) 0.98 (urban) 0.91 (rural) 1.21 (urban) 0.95 (stop) 0.975 (signal) 0.90 (stop) 0.95 (signal) 1.38 0.47 0.86 0.96 280 treated 300 control 0.74 0.92 4-leg, stop controlled, channelized on cross road 3-leg, stop controlled, painted Urban, 3-leg, stop controlled, curbed Right-turn lane on one main street approach Right-turn lanes on both main street approaches Left-turn lanes Right-turn lanes Stop controlled Signalized Stop controlled Signalized Page 168
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Transport Canada Transports Canada
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Synthesis Of Safety For Traffic Ope
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DISCLAIMER The material presented h
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EXECUTIVE SUMMARY Traffic operation
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Synthesis of Safety for Traffic Ope
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TABLE OF CONTENTS DISCLAIMER REJET
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LIST OF TABLES TABLE 3.1: Crash Rat
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Chapter 1: Chapter 1: Introductio I
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Introduction Before proceeding, a f
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Introduction Literature regarding t
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Introduction The current science of
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Introduction adequate size control
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Introduction In concluding this sec
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Chapter 3: Chapter 3: Intersectio I
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Intersection Control TABLE 3.3: Cra
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Intersection Control TABLE 3.5: CMF
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Intersection Control Vancouver Regi
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Intersection Control V m = the sum
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Intersection Control where: X1 = 0
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Intersection Control Region of Durh
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Intersection Control TABLE 3.17: CM
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Intersection Control The predictor
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Intersection Control program includ
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Intersection Control TABLE 3.26: Me
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Intersection Control TABLE 3.29: St
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Intersection Control TABLE 3.32: Ni
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Intersection Control It is noted th
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Intersection Control Sayed et al (1
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Intersection Control Signal Clearan
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Intersection Control The CMFs are 0
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Intersection Control also examined
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Intersection Control Shebeeb (1995)
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Intersection Control approaches at
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Intersection Control TABLE 3.56: Sa
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Chapter 5: Chapter 5: Pavement Pave
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Pavement Markings The study methodo
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Pavement Markings Hall (1987) Hall
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Pavement Markings TABLE 5.8: Safety
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Pavement Markings THIS PAGE IS INTE
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Chapter 7: Chapter 7: Bicycle Bicyc
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Bicycle Safety TABLE 7.1: Safety Im
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Chapter 9: Chapter 9: Turn Lanes Tu
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Turn Lanes TABLE 9.2: Safety Impact
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Turn Lanes Vogt determined that a l
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Turn Lanes 1998 one of their high c
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Turn Lanes Section TABLE 9.10: Safe
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Turn Lanes A T = ADT 0.91 L 0.852 e
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Turn Lanes CMF = 1 - 0.7 P lt/d 0.0
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Page 168 and 169: TABLE 10.3: Speed Changes Resulting
Page 170 and 171: Sites Where Applied 1 URBAN Island
Page 172 and 173: Forbes and Gill (2000) undertook a
Page 174 and 175: Ideally, three years of before and
Page 176 and 177: Kermit and Hein (1962) looked into
Page 178 and 179: The effects of the transverse pavem
Page 180: Chapter 11: Chapter 11: Other Other
Page 183 and 184: Other Safety Issues collisions per
Page 185 and 186: Other Safety Issues THIS PAGE IS IN
Page 220: References References
Page 223 and 224: References Bloch SA (1998) “Compa
Page 225 and 226: References Hamilton Associates (199
Page 227 and 228: References Lee JT, Maleck TL, and T
Page 229 and 230: References Polanis SF (1998) “Do
Page 231 and 232: References Vancouver, City of (1999
Page 233 and 234: References THIS PAGE IS INTENTIONAL
Page 242: Appendix B: Critical R Appendix B:
Page 245 and 246: Critical Reviews Worksheet for Eval
Page 247 and 248: Critical Reviews 2. Are the expecte
Page 258: Appendix D: Appendix D: How to Use
Page 261 and 262: How to Use Safety Performance Funct
Page 263 and 264: How to Use Safety Performance Funct
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