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 15 0.34 to 0.16 Right-angle 12 1.25 to 0.68 Rear-end 12 1.82 to 0.71 Left-turn 15 0.92 to 0.48 Other 15 0.93 to 0.53 All Crashes 3 N/A Fatal 9 N/A Major Injury Thomas and Smith (2001) Region of Waterloo (2001) Lovell and Hauer (1986) Laplante and Kropidlowski (1992) Signalization + Left-turn lanes Signalization Two-way # All-way stop control Two-way # All-way stop control (warranted) Two way # All way Naïve before-after of crash frequency and severity Naïve before-after of crash frequency Before-after study using likelihood functions Naïve before-after of crash frequency Naïve before after of 8 0.45 to 0.23 Minor injury 11 1.13 to 0.34 Possible injury 11 1.32 to 0.57 PDO 11 0.52 to 0.22 Right-angle 11 2.02 to 0.86 Rear-end 11 0.00 to 0.30 Left-turn 11 1.16 to 0.50 All Crashes 3 0.50 360 0.28 One year before and after periods of sites selected for high crash risk Right-angle crashes 0.87 Rear-end crashes 0.80 Left-turn crashes 0.61 Pedestrian crashes 0.29 Injury crashes 0.53 All crashes 0.29 All 16 0.21 Angle crashes 14 0.65 All Page 143
Synthesis of Safety for Traffic Operations March 2003 Researcher Treatment Study Methodology No. Sites CMF Comments stop control crash frequency 0.57 Angle (unwarranted) Two-way # All-way stop control (unwarranted) with ADT < 12,000 Naïve before-after of crash frequency 3 0.25 All 0.30 Angle Main (1984) Laplante and Kropidlowski (1992) Pant et al (1999) Two-way # All-way stop control (unwarranted) with ADT > 12,000 Regular pattern of stop signs in a residential area (by changing the stop direction at some intersections) Regular pattern of stop signs in a residential area (converting uncontrolled to stop controlled intersections) Stop # Stop + Beacon (adequate sight distance) Stop # Stop + Beacon (inadequate sight distance) * CMFs are the bounds of the 90% confidence interval Naïve before-after of crash frequency Naïve before-after of crash frequency Naïve before-after of crash frequency Cross-sectional study of crash rate Cross-sectional study of crash rate 3 1.71 All 1.29 Angle 9 0.76 All crashes 9 0.15 All crashes 7 6 0.95 1.12 1.60 1.01 Angle crashes All crashes Angle crashes All crashes Page 144
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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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Page 140 and 141: Synthesis of Safety for Traffic Ope
Page 148: 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 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
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Appendix B: Critical R Appendix B:
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Critical Reviews Worksheet for Eval
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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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