National Academies Press: OpenBook

Practices in One-Lane Traffic Control on a Two-Lane Rural Highway (2018)

Chapter: Appendix C - Survey Results on Affecting Factors

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Page 128
Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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Page 132
Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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Page 133
Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
×
Page 133
Page 134
Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
×
Page 134
Page 135
Suggested Citation:"Appendix C - Survey Results on Affecting Factors." National Academies of Sciences, Engineering, and Medicine. 2018. Practices in One-Lane Traffic Control on a Two-Lane Rural Highway. Washington, DC: The National Academies Press. doi: 10.17226/25174.
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128 The following tables are a summary of the survey responses on the factors considered in select- ing proper 1L2W traffic control methods. In each cell, percentage and actual frequency of the responses are listed. A P P E N D I X C Survey Results on Affecting Factors

Survey Results on Affecting Factors 129 Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 0.00% 0.00% 0.00% 10.00% 44.40% 0.00% 0.00% 9.10% 9.10% 9.10% 10.00% ~ ~ ~ 1 4 ~ ~ 1 1 1 1 2 0.00% 0.00% 0.00% 10.00% 22.20% 0.00% 30.00% 0.00% 9.10% 9.10% 20.00% ~ ~ ~ 1 2 ~ 3 ~ 1 1 2 3 20.00% 20.00% 20.00% 20.00% 11.10% 18.20% 0.00% 36.40% 27.30% 9.10% 20.00% 2 2 2 2 1 2 ~ 4 3 1 2 4 20.00% 50.00% 30.00% 20.00% 22.20% 36.40% 20.00% 27.30% 9.10% 45.50% 40.00% 2 5 3 2 2 4 2 3 1 5 4 5 (Very Important) 60.00% 30.00% 50.00% 40.00% 0.00% 45.50% 50.00% 27.30% 45.50% 27.30% 10.00% 6 3 5 4 ~ 5 5 3 5 3 1 Total 10 10 10 10 9 11 10 11 11 11 10 In- House 1 (Not at all Important) 11.10% 11.10% 11.10% 25.00% 28.60% 22.20% 14.30% 25.00% 37.50% 25.00% 14.30% 1 1 1 2 2 2 1 2 3 2 1 2 0.00% 11.10% 0.00% 0.00% 14.30% 0.00% 14.30% 0.00% 0.00% 0.00% 14.30% ~ 1 ~ ~ 1 ~ 1 ~ ~ ~ 1 3 22.20% 33.30% 11.10% 12.50% 14.30% 11.10% 0.00% 0.00% 0.00% 12.50% 14.30% 2 3 1 1 1 1 ~ ~ ~ 1 1 4 11.10% 0.00% 0.00% 0.00% 28.60% 0.00% 14.30% 0.00% 0.00% 12.50% 14.30% 1 ~ ~ ~ 2 ~ 1 ~ ~ 1 1 5 (Very Important) 55.60% 44.40% 77.80% 62.50% 14.30% 66.70% 57.10% 75.00% 62.50% 50.00% 42.90% 5 4 7 5 1 6 4 6 5 4 3 Total 9 9 9 8 7 9 7 8 8 8 7 In- House & Let- to-bid 1 (Not at all Important) 6.90% 10.30% 3.60% 10.30% 37.90% 17.20% 20.70% 11.10% 7.10% 17.90% 32.10% 2 3 1 3 11 5 6 3 2 5 9 2 13.80% 3.40% 3.60% 13.80% 20.70% 10.30% 10.30% 11.10% 10.70% 3.60% 10.70% 4 1 1 4 6 3 3 3 3 1 3 3 17.20% 34.50% 21.40% 24.10% 13.80% 27.60% 34.50% 33.30% 50.00% 32.10% 25.00% 5 10 6 7 4 8 10 9 14 9 7 4 20.70% 13.80% 14.30% 13.80% 6.90% 10.30% 13.80% 14.80% 14.30% 21.40% 17.90% 6 4 4 4 2 3 4 4 4 6 5 5 (Very Important) 41.40% 37.90% 57.10% 37.90% 20.70% 34.50% 20.70% 29.60% 17.90% 25.00% 14.30% 12 11 16 11 6 10 6 8 5 7 4 Total 29 29 28 29 29 29 29 27 28 28 28 Table C-1. Level of importance of the factors in selecting flagger control.

130 Practices in One-Lane Traffic Control on a Two-Lane Rural Highway Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 28.60% 57.10% 28.60% 28.60% 50.00% 57.10% 57.10% 71.40% 71.40% 71.40% 71.40% 2 4 2 2 3 4 4 5 5 5 5 2 0.00% 0.00% 0.00% 0.00% 16.70% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ 1 ~ ~ ~ ~ ~ ~ 3 28.60% 28.60% 14.30% 28.60% 16.70% 28.60% 28.60% 14.30% 14.30% 0.00% 14.30% 2 2 1 2 1 2 2 1 1 ~ 1 4 14.30% 14.30% 28.60% 0.00% 16.70% 0.00% 0.00% 0.00% 0.00% 28.60% 14.30% 1 1 2 ~ 1 ~ ~ ~ ~ 2 1 5 (Very Important) 28.60% 0.00% 28.60% 42.90% 0.00% 14.30% 14.30% 14.30% 14.30% 0.00% 0.00% 2 ~ 2 3 ~ 1 1 1 1 ~ ~ Total 7 7 7 7 6 7 7 7 7 7 7 In- House 1 (Not at all Important) 50.00% 50.00% 50.00% 50.00% 66.70% 50.00% 33.30% 33.30% 33.30% 33.30% 33.30% 2 2 2 2 2 2 1 1 1 1 1 2 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 3 25.00% 50.00% 25.00% 25.00% 33.30% 25.00% 33.30% 33.30% 33.30% 33.30% 33.30% 1 2 1 1 1 1 1 1 1 1 1 4 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 33.30% 33.30% ~ ~ ~ ~ ~ ~ ~ ~ ~ 1 1 5 (Very Important) 25.00% 0.00% 25.00% 25.00% 0.00% 25.00% 33.30% 33.30% 33.30% 0.00% 0.00% 1 ~ 1 1 ~ 1 1 1 1 ~ ~ Total 4 4 4 4 3 4 3 3 3 3 3 In- House & Let- to-bid 1 (Not at all Important) 26.30% 52.90% 15.80% 36.80% 61.10% 58.80% 52.90% 58.80% 44.40% 55.60% 66.70% 5 9 3 7 11 10 9 10 8 10 12 2 0.00% 0.00% 0.00% 5.30% 11.10% 11.80% 5.90% 5.90% 5.60% 0.00% 0.00% ~ ~ ~ 1 2 2 1 1 1 ~ ~ 3 21.10% 11.80% 10.50% 21.10% 16.70% 11.80% 23.50% 17.60% 33.30% 22.20% 16.70% 4 2 2 4 3 2 4 3 6 4 3 4 21.10% 11.80% 31.60% 15.80% 0.00% 0.00% 0.00% 0.00% 5.60% 5.60% 5.60% 4 2 6 3 ~ ~ ~ ~ 1 1 1 5 (Very Important) 31.60% 23.50% 42.10% 21.10% 11.10% 17.60% 17.60% 17.60% 11.10% 16.70% 11.10% 6 4 8 4 2 3 3 3 2 3 2 Total 19 17 19 19 18 17 17 17 18 18 18 Table C-2. Level of importance of the factors in selecting flagger with advance flagger.

Survey Results on Affecting Factors 131 Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let-to- bid 1 (Not at all Important) 60.00% 60.00% 40.00% 60.00% 80.00% 80.00% 80.00% 60.00% 60.00% 80.00% 80.00% 3 3 2 3 4 4 4 3 3 4 4 2 0.00% 0.00% 20.00% 20.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ 1 1 ~ ~ ~ ~ ~ ~ ~ 3 40.00% 20.00% 40.00% 20.00% 0.00% 20.00% 20.00% 20.00% 40.00% 0.00% 20.00% 2 1 2 1 ~ 1 1 1 2 ~ 1 4 0.00% 0.00% 0.00% 0.00% 20.00% 0.00% 0.00% 20.00% 0.00% 20.00% 0.00% ~ ~ ~ ~ 1 ~ ~ 1 ~ 1 ~ 5 (Very Important) 0.00% 20.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ 1 ~ ~ ~ ~ ~ ~ ~ ~ ~ Total 5 5 5 5 5 5 5 5 5 5 5 In- House 1 (Not at all Important) 66.70% 66.70% 66.70% 66.70% 66.70% 66.70% 50.00% 50.00% 50.00% 50.00% 50.00% 2 2 2 2 2 2 1 1 1 1 1 2 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 3 33.30% 33.30% 0.00% 33.30% 33.30% 33.30% 50.00% 50.00% 50.00% 50.00% 50.00% 1 1 ~ 1 1 1 1 1 1 1 1 4 0.00% 0.00% 33.30% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ 1 ~ ~ ~ ~ ~ ~ ~ ~ 5 (Very Important) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Total 3 3 3 3 3 3 2 2 2 2 2 In- House & Let-to- bid 1 (Not at all Important) 53.30% 50.00% 57.10% 60.00% 73.30% 60.00% 66.70% 71.40% 85.70% 64.30% 78.60% 8 8 8 9 11 9 10 10 12 9 11 2 6.70% 6.30% 7.10% 0.00% 6.70% 0.00% 0.00% 0.00% 0.00% 7.10% 0.00% 1 1 1 ~ 1 ~ ~ ~ ~ 1 ~ 3 0.00% 12.50% 14.30% 6.70% 0.00% 6.70% 20.00% 7.10% 7.10% 7.10% 7.10% ~ 2 2 1 ~ 1 3 1 1 1 1 4 13.30% 6.30% 7.10% 13.30% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 2 1 1 2 ~ ~ ~ ~ ~ ~ ~ 5 (Very Important) 26.70% 25.00% 14.30% 20.00% 20.00% 33.30% 13.30% 21.40% 7.10% 21.40% 14.30% 4 4 2 3 3 5 2 3 1 3 2 Total 15 16 14 15 15 15 15 14 14 14 14 Table C-3. Level of importance of the factors in selecting flag transfer control.

132 Practices in One-Lane Traffic Control on a Two-Lane Rural Highway Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 16.70% 16.70% 16.70% 33.30% 66.70% 50.00% 50.00% 66.70% 50.00% 33.30% 66.70% 1 1 1 2 4 3 3 4 3 2 4 2 0.00% 16.70% 0.00% 0.00% 16.70% 0.00% 16.70% 16.70% 0.00% 33.30% 16.70% ~ 1 ~ ~ 1 ~ 1 1 ~ 2 1 3 16.70% 16.70% 16.70% 16.70% 16.70% 16.70% 16.70% 16.70% 33.30% 16.70% 16.70% 1 1 1 1 1 1 1 1 2 1 1 4 0.00% 0.00% 0.00% 16.70% 0.00% 0.00% 0.00% 0.00% 16.70% 16.70% 0.00% ~ ~ ~ 1 ~ ~ ~ ~ 1 1 ~ 5 (Very Important) 66.70% 50.00% 66.70% 33.30% 0.00% 33.30% 16.70% 0.00% 0.00% 0.00% 0.00% 4 3 4 2 ~ 2 1 ~ ~ ~ ~ Total 6 6 6 6 6 6 6 6 6 6 6 In- House 1 (Not at all Important) 33.30% 33.30% 33.30% 33.30% 33.30% 33.30% 50.00% 50.00% 50.00% 50.00% 50.00% 1 1 1 1 1 1 1 1 1 1 1 2 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 3 33.30% 33.30% 33.30% 33.30% 33.30% 33.30% 50.00% 50.00% 50.00% 50.00% 50.00% 1 1 1 1 1 1 1 1 1 1 1 4 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 5 (Very Important) 33.30% 33.30% 33.30% 33.30% 33.30% 33.30% 0.00% 0.00% 0.00% 0.00% 0.00% 1 1 1 1 1 1 ~ ~ ~ ~ ~ Total 3 3 3 3 3 3 2 2 2 2 2 In- House & Let- to-bid 1 (Not at all Important) 29.40% 41.20% 35.30% 35.30% 70.60% 41.20% 41.20% 19.00% 35.30% 41.20% 50.00% 5 7 6 6 12 7 7 4 6 7 8 2 5.90% 0.00% 0.00% 0.00% 5.90% 5.90% 11.80% 19.00% 11.80% 17.60% 12.50% 1 ~ ~ ~ 1 1 2 4 2 3 2 3 5.90% 5.90% 5.90% 11.80% 11.80% 23.50% 35.30% 19.00% 29.40% 23.50% 31.30% 1 1 1 2 2 4 6 4 5 4 5 4 5.90% 5.90% 5.90% 5.90% 0.00% 5.90% 5.90% 23.80% 11.80% 5.90% 0.00% 1 1 1 1 ~ 1 1 5 2 1 ~ 5 (Very Important) 52.90% 47.10% 52.90% 47.10% 11.80% 23.50% 5.90% 19.00% 11.80% 11.80% 6.30% 9 8 9 8 2 4 1 4 2 2 1 Total 17 17 17 17 17 17 17 21 17 17 16 Table C-4. Level of importance of the factors in selecting self-managed control.

Survey Results on Affecting Factors 133 Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 12.50% 12.50% 0.00% 25.00% 57.10% 37.50% 25.00% 25.00% 37.50% 12.50% 28.60% 1 1 ~ 2 4 3 2 2 3 1 2 2 0.00% 0.00% 0.00% 12.50% 0.00% 0.00% 0.00% 0.00% 0.00% 12.50% 14.30% ~ ~ ~ 1 ~ ~ ~ ~ ~ 1 1 3 37.50% 12.50% 37.50% 12.50% 14.30% 37.50% 12.50% 50.00% 25.00% 37.50% 28.60% 3 1 3 1 1 3 1 4 2 3 2 4 12.50% 25.00% 12.50% 0.00% 28.60% 0.00% 25.00% 0.00% 25.00% 12.50% 14.30% 1 2 1 ~ 2 ~ 2 ~ 2 1 1 5 (Very Important) 37.50% 50.00% 50.00% 50.00% 0.00% 25.00% 37.50% 25.00% 12.50% 25.00% 14.30% 3 4 4 4 ~ 2 3 2 1 2 1 Total 8 8 8 8 7 8 8 8 8 8 7 In- House 1 (Not at all Important) 16.70% 16.70% 16.70% 16.70% 0.00% 16.70% 20.00% 20.00% 20.00% 20.00% 40.00% 1 1 1 1 ~ 1 1 1 1 1 2 2 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 20.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ 1 ~ ~ ~ ~ 3 33.30% 16.70% 16.70% 16.70% 20.00% 33.30% 40.00% 40.00% 40.00% 40.00% 40.00% 2 1 1 1 1 2 2 2 2 2 2 4 0.00% 16.70% 0.00% 0.00% 60.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% ~ 1 ~ ~ 3 ~ ~ ~ ~ ~ ~ 5 (Very Important) 50.00% 50.00% 66.70% 66.70% 20.00% 50.00% 20.00% 40.00% 40.00% 40.00% 20.00% 3 3 4 4 1 3 1 2 2 2 1 Total 6 6 6 6 5 6 5 5 5 5 5 In- House & Let- to-bid 1 (Not at all Important) 27.80% 31.60% 38.90% 38.90% 55.60% 27.80% 31.60% 33.30% 44.40% 36.80% 57.90% 5 6 7 7 10 5 6 6 8 7 11 2 11.10% 10.50% 0.00% 5.60% 16.70% 11.10% 5.30% 5.60% 16.70% 5.30% 0.00% 2 2 ~ 1 3 2 1 1 3 1 ~ 3 16.70% 15.80% 0.00% 0.00% 11.10% 22.20% 31.60% 33.30% 22.20% 21.10% 21.10% 3 3 ~ ~ 2 4 6 6 4 4 4 4 5.60% 10.50% 5.60% 27.80% 5.60% 5.60% 10.50% 5.60% 0.00% 15.80% 10.50% 1 2 1 5 1 1 2 1 ~ 3 2 5 (Very Important) 38.90% 31.60% 55.60% 27.80% 11.10% 33.30% 21.10% 22.20% 16.70% 21.10% 10.50% 7 6 10 5 2 6 4 4 3 4 2 Total 18 19 18 18 18 18 19 18 18 19 19 Table C-5. Level of importance of the factors in selecting AFADs.

134 Practices in One-Lane Traffic Control on a Two-Lane Rural Highway Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 0.00% 0.00% 0.00% 10.00% 55.60% 30.00% 0.00% 30.00% 20.00% 10.00% 20.00% ~ ~ ~ 1 5 3 ~ 3 2 1 2 2 10.00% 10.00% 10.00% 10.00% 11.10% 10.00% 0.00% 30.00% 10.00% 20.00% 30.00% 1 1 1 1 1 1 ~ 3 1 2 3 3 20.00% 10.00% 10.00% 20.00% 22.20% 40.00% 18.20% 20.00% 20.00% 20.00% 10.00% 2 1 1 2 2 4 2 2 2 2 1 4 30.00% 30.00% 30.00% 20.00% 11.10% 10.00% 27.30% 0.00% 20.00% 20.00% 20.00% 3 3 3 2 1 1 3 ~ 2 2 2 5 (Very Important) 40.00% 50.00% 50.00% 40.00% 0.00% 10.00% 54.50% 20.00% 30.00% 30.00% 20.00% 4 5 5 4 ~ 1 6 2 3 3 2 Total 10 10 10 10 9 10 11 10 10 10 10 In- House 1 (Not at all Important) 16.70% 14.30% 14.30% 16.70% 20.00% 16.70% 0.00% 0.00% 16.70% 20.00% 0.00% 1 1 1 1 1 1 ~ ~ 1 1 ~ 2 0.00% 0.00% 0.00% 0.00% 0.00% 16.70% 0.00% 16.70% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ 1 ~ 1 ~ ~ ~ 3 16.70% 14.30% 14.30% 16.70% 40.00% 50.00% 16.70% 16.70% 16.70% 40.00% 16.70% 1 1 1 1 2 3 1 1 1 2 1 4 0.00% 28.60% 14.30% 0.00% 20.00% 0.00% 16.70% 16.70% 16.70% 0.00% 33.30% ~ 2 1 ~ 1 ~ 1 1 1 ~ 2 5 (Very Important) 66.70% 42.90% 57.10% 66.70% 20.00% 16.70% 66.70% 50.00% 50.00% 40.00% 50.00% 4 3 4 4 1 1 4 3 3 2 3 Total 6 7 7 6 5 6 6 6 6 5 6 In- House & Let- to-bid 1 (Not at all Important) 14.30% 10.30% 11.10% 14.30% 64.30% 35.70% 0.00% 37.00% 14.80% 32.10% 27.60% 4 3 3 4 18 10 ~ 10 4 9 8 2 7.10% 6.90% 3.70% 21.40% 7.10% 14.30% 6.70% 11.10% 7.40% 10.70% 6.90% 2 2 1 6 2 4 2 3 2 3 2 3 21.40% 13.80% 18.50% 14.30% 14.30% 17.90% 20.00% 29.60% 18.50% 25.00% 27.60% 6 4 5 4 4 5 6 8 5 7 8 4 21.40% 17.20% 7.40% 25.00% 7.10% 7.10% 20.00% 7.40% 29.60% 21.40% 17.20% 6 5 2 7 2 2 6 2 8 6 5 5 (Very Important) 35.70% 51.70% 59.30% 25.00% 7.10% 25.00% 53.30% 14.80% 29.60% 10.70% 20.70% 10 15 16 7 2 7 16 4 8 3 6 Total 28 29 27 28 28 28 30 27 27 28 29 Table C-6. Level of importance of the factors in selecting TTCSs.

Survey Results on Affecting Factors 135 Type Level of Importance Factors Topography Length of Closure Sight Distance Alignment Weather Short- Term Long- Term Daytime Operations Only Daytime and Nighttime Working Hours Non- Working Hours Let- to-bid 1 (Not at all Important) 10.00% 10.00% 10.00% 40.00% 44.40% 10.00% 0.00% 10.00% 10.00% 10.00% 20.00% 1 1 1 4 4 1 ~ 1 1 1 2 2 30.00% 0.00% 10.00% 20.00% 11.10% 0.00% 20.00% 0.00% 0.00% 20.00% 30.00% 3 ~ 1 2 1 ~ 2 ~ ~ 2 3 3 20.00% 10.00% 20.00% 20.00% 33.30% 40.00% 60.00% 50.00% 50.00% 10.00% 20.00% 2 1 2 2 3 4 6 5 5 1 2 4 30.00% 40.00% 40.00% 0.00% 11.10% 20.00% 10.00% 0.00% 10.00% 20.00% 20.00% 3 4 4 ~ 1 2 1 ~ 1 2 2 5 (Very Important) 10.00% 40.00% 20.00% 20.00% 0.00% 30.00% 10.00% 40.00% 30.00% 40.00% 10.00% 1 4 2 2 ~ 3 1 4 3 4 1 Total 10 10 10 10 9 10 10 10 10 10 10 In- House 1 (Not at all Important) 0.00% 0.00% 0.00% 16.70% 20.00% 16.70% 20.00% 16.70% 20.00% 20.00% 40.00% ~ ~ ~ 1 1 1 1 1 1 1 2 2 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 20.00% 0.00% 0.00% 0.00% 0.00% ~ ~ ~ ~ ~ ~ 1 ~ ~ ~ ~ 3 33.30% 16.70% 50.00% 33.30% 40.00% 16.70% 40.00% 33.30% 20.00% 40.00% 40.00% 2 1 3 2 2 1 2 2 1 2 2 4 16.70% 16.70% 0.00% 0.00% 20.00% 16.70% 0.00% 0.00% 0.00% 0.00% 0.00% 1 1 ~ ~ 1 1 ~ ~ ~ ~ ~ 5 (Very Important) 50.00% 66.70% 50.00% 50.00% 20.00% 50.00% 20.00% 50.00% 60.00% 40.00% 20.00% 3 4 3 3 1 3 1 3 3 2 1 Total 6 6 6 6 5 6 5 6 5 5 5 In- House & Let- to-bid 1 (Not at all Important) 18.20% 4.20% 19.00% 22.70% 54.50% 30.40% 13.00% 19.00% 9.50% 22.70% 33.30% 4 1 4 5 12 7 3 4 2 5 7 2 13.60% 12.50% 19.00% 31.80% 22.70% 21.70% 26.10% 19.00% 19.00% 9.10% 9.50% 3 3 4 7 5 5 6 4 4 2 2 3 18.20% 12.50% 23.80% 22.70% 13.60% 34.80% 34.80% 19.00% 33.30% 36.40% 28.60% 4 3 5 5 3 8 8 4 7 8 6 4 27.30% 16.70% 4.80% 9.10% 4.50% 0.00% 8.70% 23.80% 19.00% 18.20% 14.30% 6 4 1 2 1 ~ 2 5 4 4 3 5 (Very Important) 22.70% 54.20% 33.30% 13.60% 4.50% 13.00% 17.40% 19.00% 19.00% 13.60% 14.30% 5 13 7 3 1 3 4 4 4 3 3 Total 22 24 21 22 22 23 23 21 21 22 21 Table C-7. Level of importance of the factors in selecting pilot car.

Next: Appendix D - Survey Respondents »
Practices in One-Lane Traffic Control on a Two-Lane Rural Highway Get This Book
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 Practices in One-Lane Traffic Control on a Two-Lane Rural Highway
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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 525: Practices in One-Lane Traffic Control on a Two-Lane Rural Highway identifies innovative practices and devices for establishing one-lane traffic control on rural two-lane highways. Temporary traffic control, also known as maintenance of traffic, is critical to minimizing congestion and maintaining mobility during planned and unplanned activities as well as providing a safe work zone for both road users and workers. Innovative examples of one-lane two-way traffic control operations at roundabouts and applications of temporary portable rumble strips and driveway assistance devices are also discussed in this synthesis, providing additional insights on the state of the practice.

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