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From page 262... ... Rumble strip statistics are bolded whenever the effect is statistically signiﬁcant at the 0.10 level • Overdispersion parameter: estimate and standard error GLM Analysis Results for Safety Effectiveness of Shoulder Rumble Strips Each regression model is represented by the following equation: where a (i.e., intercept) , b, c, and d are the coefﬁcients whose estimates are shown in Tables F-1 through F-8. Read the entire page →
From page 263... ... Intercept lnADT Outside RHR Rumble strips a Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –11.19 1.27 1.08 0.12 <.0001 0.20 0.12 0.086 –0.10 0.08 0.222 0.28 0.05 Combined –10.55 1.26 1.08 0.13 <.0001 –0.08 0.07 0.284 0.10 0.03 MO –9.95 1.67 1.02 0.17 <.0001 –0.03 0.09 0.758 0.12 0.04Rural freeways PA –10.16 2.32 1.04 0.24 <.0001 –0.12 0.12 0.316 0.06 0.07 Combined –7.71 1.24 0.72 0.13 <.0001 0.23 0.07 0.001 0.01 0.11 0.956 0.22 0.04 MN –9.18 1.27 0.90 0.14 <.0001 0.11 0.07 0.131 0.07 0.09 0.474 0.09 0.04 MO –14.93 3.71 1.59 0.40 <.0001 0.05 0.20 0.799 0.38 0.12 Rural multilane divided highways (nonfreeways) PA 0.28 0.24 –0.54 0.27 0.045 0.40 0.22 Combined –7.16 0.77 0.65 0.09 <.0001 0.31 0.05 <.0001 –0.32 0.12 0.006 0.50 0.06 MN –6.45 1.10 0.53 0.14 0.0002 0.31 0.06 <.0001 –0.14 0.10 0.155 0.24 0.08 MO –8.37 1.95 0.61 0.25 0.013 0.71 0.19 0.0002 –0.51 0.75 0.501 0.51 0.11 Rural two-lane roads PA –5.44 0.86 0.61 0.10 <.0001 –0.18 0.22 0.415 0.37 0.08 a Statistics are bolded when p ≤ 0.10. Read the entire page →
From page 264... ... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –6.92 1.15 0.67 0.11 <.0001 0.02 0.10 0.862 0.20 0.07 Combined –8.53 1.48 0.76 0.15 <.0001 0.22 0.11 0.042 –0.15 0.08 0.078 0.19 0.06 MO –6.75 1.85 0.65 0.19 0.001 –0.13 0.10 0.173 0.20 0.07 Rural freeways PA –9.99 2.78 0.89 0.29 0.002 0.29 0.16 0.076 –0.14 0.16 0.383 0.17 0.10 Combined –7.19 1.48 0.58 0.16 0.0004 0.32 0.10 0.001 0.05 0.14 0.738 0.45 0.09 MN –9.50 1.49 0.88 0.15 <.0001 0.12 0.14 0.398 0.22 0.08 MO –15.15 3.96 1.56 0.42 0.000 0.17 0.21 0.422 0.59 0.20 Rural multilane divided highways (nonfreeways) PA –0.07 0.28 –0.40 0.28 0.156 0.58 0.32 Combined –5.46 0.77 0.32 0.10 0.001 0.41 0.06 <.0001 –0.47 0.16 0.004 0.85 0.13 MN –4.50 1.19 0.26 0.15 0.084 0.04 0.17 0.840 1.16 0.33 MO –8.46 2.18 0.40 0.24 0.094 0.95 0.15 <.0001 –0.90 1.38 0.515 0.19 0.14 Rural two-lane roads PA –2.96 0.94 0.25 0.12 0.035 –0.47 0.24 0.054 0.57 0.14 a Statistics are bolded when p ≤ 0.10. Read the entire page →
From page 265... ... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –10.24 1.50 1.05 0.14 <.0001 –0.23 0.10 0.019 0.29 0.05 Combined –9.51 1.58 0.97 0.16 <.0001 –0.04 0.09 0.631 0.12 0.04 MO –9.70 2.26 0.99 0.23 <.0001 –0.01 0.10 0.888 0.13 0.04 Rural freeways PA –5.19 3.37 0.52 0.35 0.134 –0.09 0.15 0.555 0.08 0.08 Combined –7.49 1.52 0.70 0.17 <.0001 0.23 0.09 0.007 0.05 0.17 0.766 0.29 0.06 MN –8.70 1.48 0.87 0.15 <.0001 –0.20 0.18 0.278 0.08 0.05 MO –15.91 3.83 1.70 0.41 <.0001 0.02 0.21 0.929 0.38 0.12 Rural multilane divided highways (nonfreeways) PA –1.02 9.61 0.14 1.03 0.893 –0.58 0.29 0.045 0.41 0.22 Combined –6.86 0.75 0.63 0.09 <.0001 0.28 0.05 <.0001 –0.16 0.13 0.244 0.54 0.06 MN –5.99 1.06 0.47 0.13 0.000 0.31 0.06 <.0001 0.07 0.15 0.648 0.28 0.10 MO –8.46 1.91 0.63 0.24 0.010 0.70 0.19 0.000 –0.44 0.76 0.567 0.50 0.11 Rural two-lane roads PA –5.44 0.86 0.61 0.10 <.0001 –0.18 0.22 0.415 0.37 0.08 a Statistics are bolded when p ≤ 0.10. Read the entire page →
From page 266... ... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –6.95 1.39 0.67 0.13 <.0001 –0.10 0.13 0.43 0.18 0.08 Combined –6.61 1.89 0.63 0.19 0.001 –0.19 0.10 0.05 0.21 0.07 MO –8.20 2.37 0.79 0.24 0.001 –0.15 0.11 0.18 0.22 0.08 Rural freeways PA –1.86 3.25 0.14 0.34 0.680 –0.25 0.20 0.21 0.17 0.13 Combined –7.07 1.79 0.57 0.20 0.004 0.30 0.12 0.014 0.14 0.20 0.50 0.52 0.11 MN –8.15 1.71 0.74 0.18 <.0001 –0.16 0.19 0.40 0.16 0.09 MO –16.48 3.99 1.70 0.43 <.0001 0.11 0.21 0.60 0.60 0.21 Rural multilane divided highways (nonfreeways) PA –0.04 0.29 –0.24 0.20 0.23 0.59 0.32 Combined –5.39 0.80 0.31 0.10 0.003 0.41 0.06 <.0001 –0.50 0.20 0.01 0.86 0.14 MN –3.83 1.22 0.17 0.16 0.286 –0.26 0.25 0.30 1.26 0.47 MO –8.49 2.16 0.41 0.24 0.087 0.94 0.15 <.0001 –0.84 1.43 0.56 0.19 0.14 Rural two-lane roads PA –2.96 0.94 0.25 0.12 0.035 –0.47 0.24 0.05 0.57 0.14 a Statistics are bolded when p ≤ 0.10. Read the entire page →

From page 262...

... Rumble strip statistics are bolded whenever the effect is statistically signiﬁcant at the 0.10 level • Overdispersion parameter: estimate and standard error GLM Analysis Results for Safety Effectiveness of Shoulder Rumble Strips Each regression model is represented by the following equation: where a (i.e., intercept) , b, c, and d are the coefﬁcients whose estimates are shown in Tables F-1 through F-8.

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From page 263...

... Intercept lnADT Outside RHR Rumble strips a Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –11.19 1.27 1.08 0.12 <.0001 0.20 0.12 0.086 –0.10 0.08 0.222 0.28 0.05 Combined –10.55 1.26 1.08 0.13 <.0001 –0.08 0.07 0.284 0.10 0.03 MO –9.95 1.67 1.02 0.17 <.0001 –0.03 0.09 0.758 0.12 0.04Rural freeways PA –10.16 2.32 1.04 0.24 <.0001 –0.12 0.12 0.316 0.06 0.07 Combined –7.71 1.24 0.72 0.13 <.0001 0.23 0.07 0.001 0.01 0.11 0.956 0.22 0.04 MN –9.18 1.27 0.90 0.14 <.0001 0.11 0.07 0.131 0.07 0.09 0.474 0.09 0.04 MO –14.93 3.71 1.59 0.40 <.0001 0.05 0.20 0.799 0.38 0.12 Rural multilane divided highways (nonfreeways) PA 0.28 0.24 –0.54 0.27 0.045 0.40 0.22 Combined –7.16 0.77 0.65 0.09 <.0001 0.31 0.05 <.0001 –0.32 0.12 0.006 0.50 0.06 MN –6.45 1.10 0.53 0.14 0.0002 0.31 0.06 <.0001 –0.14 0.10 0.155 0.24 0.08 MO –8.37 1.95 0.61 0.25 0.013 0.71 0.19 0.0002 –0.51 0.75 0.501 0.51 0.11 Rural two-lane roads PA –5.44 0.86 0.61 0.10 <.0001 –0.18 0.22 0.415 0.37 0.08 a Statistics are bolded when p ≤ 0.10.

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From page 264...

... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –6.92 1.15 0.67 0.11 <.0001 0.02 0.10 0.862 0.20 0.07 Combined –8.53 1.48 0.76 0.15 <.0001 0.22 0.11 0.042 –0.15 0.08 0.078 0.19 0.06 MO –6.75 1.85 0.65 0.19 0.001 –0.13 0.10 0.173 0.20 0.07 Rural freeways PA –9.99 2.78 0.89 0.29 0.002 0.29 0.16 0.076 –0.14 0.16 0.383 0.17 0.10 Combined –7.19 1.48 0.58 0.16 0.0004 0.32 0.10 0.001 0.05 0.14 0.738 0.45 0.09 MN –9.50 1.49 0.88 0.15 <.0001 0.12 0.14 0.398 0.22 0.08 MO –15.15 3.96 1.56 0.42 0.000 0.17 0.21 0.422 0.59 0.20 Rural multilane divided highways (nonfreeways) PA –0.07 0.28 –0.40 0.28 0.156 0.58 0.32 Combined –5.46 0.77 0.32 0.10 0.001 0.41 0.06 <.0001 –0.47 0.16 0.004 0.85 0.13 MN –4.50 1.19 0.26 0.15 0.084 0.04 0.17 0.840 1.16 0.33 MO –8.46 2.18 0.40 0.24 0.094 0.95 0.15 <.0001 –0.90 1.38 0.515 0.19 0.14 Rural two-lane roads PA –2.96 0.94 0.25 0.12 0.035 –0.47 0.24 0.054 0.57 0.14 a Statistics are bolded when p ≤ 0.10.

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From page 265...

... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –10.24 1.50 1.05 0.14 <.0001 –0.23 0.10 0.019 0.29 0.05 Combined –9.51 1.58 0.97 0.16 <.0001 –0.04 0.09 0.631 0.12 0.04 MO –9.70 2.26 0.99 0.23 <.0001 –0.01 0.10 0.888 0.13 0.04 Rural freeways PA –5.19 3.37 0.52 0.35 0.134 –0.09 0.15 0.555 0.08 0.08 Combined –7.49 1.52 0.70 0.17 <.0001 0.23 0.09 0.007 0.05 0.17 0.766 0.29 0.06 MN –8.70 1.48 0.87 0.15 <.0001 –0.20 0.18 0.278 0.08 0.05 MO –15.91 3.83 1.70 0.41 <.0001 0.02 0.21 0.929 0.38 0.12 Rural multilane divided highways (nonfreeways) PA –1.02 9.61 0.14 1.03 0.893 –0.58 0.29 0.045 0.41 0.22 Combined –6.86 0.75 0.63 0.09 <.0001 0.28 0.05 <.0001 –0.16 0.13 0.244 0.54 0.06 MN –5.99 1.06 0.47 0.13 0.000 0.31 0.06 <.0001 0.07 0.15 0.648 0.28 0.10 MO –8.46 1.91 0.63 0.24 0.010 0.70 0.19 0.000 –0.44 0.76 0.567 0.50 0.11 Rural two-lane roads PA –5.44 0.86 0.61 0.10 <.0001 –0.18 0.22 0.415 0.37 0.08 a Statistics are bolded when p ≤ 0.10.

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From page 266...

... Intercept lnADT Outside RHR Rumble stripsa Overdispersion Roadway type State Estimate SE Estimate SE p-value Estimate SE p-value Estimate SE p-value Estimate SE Urban freeways PA –6.95 1.39 0.67 0.13 <.0001 –0.10 0.13 0.43 0.18 0.08 Combined –6.61 1.89 0.63 0.19 0.001 –0.19 0.10 0.05 0.21 0.07 MO –8.20 2.37 0.79 0.24 0.001 –0.15 0.11 0.18 0.22 0.08 Rural freeways PA –1.86 3.25 0.14 0.34 0.680 –0.25 0.20 0.21 0.17 0.13 Combined –7.07 1.79 0.57 0.20 0.004 0.30 0.12 0.014 0.14 0.20 0.50 0.52 0.11 MN –8.15 1.71 0.74 0.18 <.0001 –0.16 0.19 0.40 0.16 0.09 MO –16.48 3.99 1.70 0.43 <.0001 0.11 0.21 0.60 0.60 0.21 Rural multilane divided highways (nonfreeways) PA –0.04 0.29 –0.24 0.20 0.23 0.59 0.32 Combined –5.39 0.80 0.31 0.10 0.003 0.41 0.06 <.0001 –0.50 0.20 0.01 0.86 0.14 MN –3.83 1.22 0.17 0.16 0.286 –0.26 0.25 0.30 1.26 0.47 MO –8.49 2.16 0.41 0.24 0.087 0.94 0.15 <.0001 –0.84 1.43 0.56 0.19 0.14 Rural two-lane roads PA –2.96 0.94 0.25 0.12 0.035 –0.47 0.24 0.05 0.57 0.14 a Statistics are bolded when p ≤ 0.10.

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