Journal of Advanced Transportation / 2024 / Article / Tab 1 / Research Article
Analysis of Factors Affecting the Severity of Injuries in Electric Two-Wheeled Vehicle Crashes with or without Violation: A Random Parametric Logit Model considering Heterogeneity of Means and Variances Variable type Variable description Variable symbols No violations Existence of violations (%)MI (%) FS (%) (%)MI (%) FS (%) Sex Female — 10.82 41.40 18.37 14.97 36.39 11.60 Male 1.73 21.11 6.57 5.43 27.32 4.30 Age <18 — 0.78 3.93 0.62 3.09 6.74 0.37 18–32 1.99 6.18 1.47 4.21 8.04 0.75 32–46 3.18 11.25 3.57 4.49 10.48 1.87 46–60 4.79 21.79 8.31 5.89 19.27 6.27 >60 1.81 19.35 10.97 2.71 19.18 6.64 Pavement condition Pavement good — 11.69 61.94 24.53 17.31 62.39 15.43 Pavement damage 0.85 0.57 0.41 3.09 1.31 0.47 Road surface condition dry — 11.82 57.75 23.08 19.36 58.84 14.41 damp 0.72 4.76 1.86 1.03 4.86 1.50 Lighting conditions Day — 7.87 42.74 16.51 14.87 44.90 10.48 Dusk/dawn 1.11 3.67 2.10 0.75 2.71 1.03 Street lights at night 2.25 10.17 3.73 3.37 10.57 2.90 No street lamp at night 1.32 5.92 2.61 1.59 5.52 1.50 The road alignment Straight — 10.66 55.19 20.67 19.08 57.81 14.59 Tortuous 1.89 7.32 4.27 1.31 5.89 1.31 Road type General urban Road — 5.41 23.00 6.24 10.38 29.75 5.61 Class I-IV highway 3.67 23.26 12.06 5.89 21.23 7.20 Substandard highway 3.47 16.25 6.65 4.12 12.72 3.09 Crash site Motorway — 8.10 43.91 18.03 11.23 38.63 12.35 Nonmotorized lane 2.41 8.75 3.00 5.89 16.18 1.50 Mixed lane 1.37 7.19 2.41 2.62 6.08 0.84 Sidewalk 0.67 2.66 1.50 0.65 2.81 1.22 Pavement material Asphalt — 11.88 59.30 23.10 20.11 61.37 15.25 Nonbituminous 0.67 3.21 1.84 0.28 2.34 0.65 Impact angle Side impact — 7.74 49.86 19.38 13.10 47.15 11.60 Frontal collision 4.06 13.38 1.40 1.78 6.55 1.31 Rear impact 0.96 5.43 2.48 0.94 5.43 0.94 Other angles 3.18 3.16 1.68 4.58 4.58 2.06 Traffic control mode Signal control — 2.87 12.86 4.68 5.05 14.78 1.87 Uncontrolled 3.54 23.75 11.88 5.14 23.57 37.51 Marking control 6.13 25.90 9.16 10.20 25.35 4.58 Weekly parameters Working days — 9.34 45.30 17.00 14.59 47.24 11.60 Rest day 3.21 17.21 7.94 5.80 16.46 4.30 Season Spring — 4.09 18.47 7.71 7.02 19.08 5.14 Summer 2.85 15.19 4.86 6.64 19.08 3.18 Autumn 3.29 17.59 7.30 3.74 15.25 5.33 Winter 2.33 11.25 5.07 2.99 10.29 2.25 Weather Sunny — 11.38 20.57 22.17 19.08 55.75 13.66 Severe weather 1.16 4.14 2.77 1.31 7.95 2.25 Visibility >200 m — 7.61 37.80 14.70 13.47 39.10 9.07 <200 m 4.94 24.71 10.25 6.92 24.60 6.83 Terrain Flat — 10.04 52.99 19.97 18.33 56.22 13.10 Nonflat 2.51 9.52 4.97 2.06 7.48 2.81
Note. “
”is a reference variable.