Synthesis of Safety for Traffic Operations - Transports Canada

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Synthesis of Safety for Traffic Operations March 2003 25 20 Minor AADT = 3,000 Crashes/year 15 10 AWF Non-AWF 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Major Road AADT (thousands) 30 Crashes/year 25 20 15 10 Minor AADT = 8,000 Non-AWF AWF 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Major Road AADT (thousands) 40 35 30 Minor AADT = 18,000 Crashes/year 25 20 15 10 Non-AWF AWF 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Major Road AADT (thousands) FIGURE 3.1: Advance Warning Flashers Page 47
Intersection Control Signal Clearance Timing Lalani (1991) The City of San Buenaventura, California as part of a Comprehensive Safety Program improved the clearance timing at three signalized intersections (Lalani, 1991). Sites were selected because they were considered high crash locations. The analysis was a naïve before-after analysis using crash frequency and one-year before and after periods. Details of the treatment are not reported (i.e., what was the original clearance timing? And what was the exact countermeasure?). Nonetheless, the safety impacts of the improved signal timing are shown in Table 3.41. TABLE 3.41: Safety Impacts of Improved Clearance Timing in California Location Crashes Before After CMF A 17 7 0.41 B 7 4 0.57 C 10 6 0.60 Totals 34 17 0.50 Lalani does not account for exposure in the safety analysis but reports that traffic volumes in the city increase at an average rate of 6% per annum. Signal Coordination Lalani (1999) The City of San Buenaventura, California as part of a Comprehensive Safety Program introduced coordination to at least three areas of the city (Lalani, 1991). Sites were selected because they were considered high crash locations. The analysis was a naïve before-after analysis using crash frequency and one-year before and after periods. Details of the treatment are not reported. Nonetheless, the safety impacts of the improved signal coordination are shown in Table 3.42. TABLE 3.42: Safety Impacts of Signal Coordination in California Location Crashes Before After CMF A 179 129 0.72 B 16 12 0.75 C 129 103 0.80 Totals 324 244 0.75 Page 48
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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
Page 27 and 28: Introduction Before proceeding, a f
Page 29 and 30: Introduction Literature regarding t
Page 31 and 32: Introduction The current science of
Page 33 and 34: Introduction adequate size control
Page 35 and 36: Introduction In concluding this sec
Page 38 and 39: Synthesis of Safety for Traffic Ope
Page 42: Chapter 3: Chapter 3: Intersectio I
Page 45 and 46: Intersection Control TABLE 3.3: Cra
Page 47 and 48: Intersection Control TABLE 3.5: CMF
Page 49 and 50: Intersection Control Vancouver Regi
Page 51 and 52: Intersection Control V m = the sum
Page 53 and 54: Intersection Control where: X1 = 0
Page 55 and 56: Intersection Control Region of Durh
Page 57 and 58: Intersection Control TABLE 3.17: CM
Page 59 and 60: Intersection Control The predictor
Page 63 and 64: Intersection Control program includ
Page 65 and 66: Intersection Control TABLE 3.26: Me
Page 67 and 68: Intersection Control TABLE 3.29: St
Page 69 and 70: Intersection Control TABLE 3.32: Ni
Page 73 and 74: Intersection Control It is noted th
Page 75: Intersection Control Sayed et al (1
Page 79 and 80: Intersection Control The CMFs are 0
Page 81 and 82: Intersection Control also examined
Page 83 and 84: Intersection Control Shebeeb (1995)
Page 85 and 86: Intersection Control approaches at
Page 89 and 90: Intersection Control TABLE 3.56: Sa
Page 102: Chapter 5: Chapter 5: Pavement Pave
Page 105 and 106: Pavement Markings The study methodo
Page 107 and 108: Pavement Markings Hall (1987) Hall
Page 109 and 110: Pavement Markings TABLE 5.8: Safety
Page 111 and 112: Pavement Markings THIS PAGE IS INTE
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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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Turn Lanes occurred within 250 feet
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TABLE 10.3: Speed Changes Resulting
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Sites Where Applied 1 URBAN Island
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Forbes and Gill (2000) undertook a
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Ideally, three years of before and
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Kermit and Hein (1962) looked into
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The effects of the transverse pavem
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Chapter 11: Chapter 11: Other Other
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Other Safety Issues collisions per
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Other Safety Issues THIS PAGE IS IN
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References References
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References Bloch SA (1998) “Compa
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References Hamilton Associates (199
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References Lee JT, Maleck TL, and T
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References Polanis SF (1998) “Do
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References Vancouver, City of (1999
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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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