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 0.91 Cross-sectional study 63 0.72 of crash rates 0.78 All Crashes Hamilton Associates (1998) Polanis (1998) Sayed et al (1999) Gibby et al (1992) Lalani (1991) Greiwe (1986) Additional primary signal head Replace eight inch lenses with 12 inch lenses Addition of advance warning signs Addition of advance warning signs Addition of advance flashers Addition of advance warning sign and flasher Improved clearance timing Improved signal coordination Convert two-phase operation to split (three) phase operation Before-after using EB methods Naïve before-after of crash frequency Before-after using EB methods Cross-section study of crash rates Naïve before-after study of crash frequency Naïve before-after study of crash frequency 8 38 25 0.83 to 0.79 0.69 to 0.64 0.78 to 0.72 0.52 0.84 1.03 to 0.92 0.91 to 0.86 0.92 to 0.82 85 3.37 77 1.35 14 1.87 3 0.50 3 0.75 8 0.22 0.67 0.76 0.46 Casualty crashes PDO Casualty crashes PDO All Crashes Angle crashes All crashes Rear-end crashes Casualty crashes All crashes No details of exact treatment, small sample size No details of exact treatment, small sample size Left-turn crashes Angle crashes Rear-end crashes All crashes Page 155
Synthesis of Safety for Traffic Operations March 2003 Researcher Treatment Study Methodology No. Sites CMF Comments 1.24 Left-turn crashes Remove unwarranted 0.78 Angle crashes 14 protected left-turn phase 0.77 Rear-end crashes 0.95 All crashes Hummer et al (1991) Convert leading to Cross-section study of 29 0.67 Left-turn crashes Upchurch (1991) lagging left-turn phase Permissive # leading protected/permissive Permissive # lagging protected/permissive Permissive # leading protected Permissive # lagging protected Permissive # leading protected/permissive Permissive # lagging protected/permissive Leading protected/ permissive # Permissive Lead protected/ permissive # Lagging protected/ permissive Leading protected # Leading protected/ permissive crash rates Naïve before-after of left-turn crash rates 224 1.19 206 0.69 219 0.35 166 0.14 17 0.73 9 0.76 14 1.29 35 0.73 3 3.34 Left-turn crashes Two opposing lanes Page 156
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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
Page 151 and 152: Turn Lanes TABLE 9.2: Safety Impact
Page 153 and 154: Turn Lanes Vogt determined that a l
Page 155 and 156: Turn Lanes 1998 one of their high c
Page 157 and 158: Turn Lanes Section TABLE 9.10: Safe
Page 159 and 160: Turn Lanes A T = ADT 0.91 L 0.852 e
Page 161 and 162: Turn Lanes CMF = 1 - 0.7 P lt/d 0.0
Page 163 and 164: Turn Lanes occurred within 250 feet
Page 166 and 167: Synthesis of Safety for Traffic Ope
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
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Appendix D: Appendix D: How to Use
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How to Use Safety Performance Funct
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How to Use Safety Performance Funct
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