## 2 Materials and Methods
### Data
\begin{table}
\begin{tabular}{c c c c c} \hline
**Variable Type** & **Variable** & **Description** & **Description** & **Proportion (\%)** \\ \hline Dependent Variables & Crash Injury levels & The severity of a crash based on the most severe injury to any person involved in the crash. & \(0=\) Non-tatal & \(60.4\%\) \\  & & & \(1=\) Fatal & \(39.6\%\) \\ \hline  & Gender of driver & The sex of person involved in a crash. & \(0=\) Male & \(89.3\%\) \\  & & & \(1=\) Female & \(10.7\%\) \\ \cline{2-5}  & Age of driver & The age of driver involved in a crash. If it not available, the approximate age. & \(0\leq 25\) years & \(8.8\%\) \\  & & & \(1=\) 26-45 years & \(56.7\%\) \\  & & & \(2=\) 46-60 years & \(26.7\%\) \\  & & & \(3>60\) years & \(7.9\%\) \\ \cline{2-5} Crash Attributes at & Driving experience & The number of years a driver has been licensed to drive & \(0=\) 0-6 years & \(45.4\%\) \\ Fault & & & \(1=\) 7-16 years & \(36.8\%\) \\ \cline{2-5}  & Liability & The liability of driver in the accident is determined & \(2>16\) years & \(17.8\%\) \\ \cline{2-5}  & & & \(0=\) Full Liability & \(47.7\%\) \\  & & & \(1=\) Primary Liability & \(29.2\%\) \\  & & & \(2=\) residual Liability & \(23.1\%\) \\ \cline{2-5}  & & & \(0=\) Pedestrian & \(1.0\%\) \\  & & & \(1=\) Non-Motorized Vehicle & \(12.0\%\) \\  & Travel mode & The type of vehicle by the driver & \(2=\) Motorcycle & \(6.8\%\) \\  & & & \(3=\) Motorcar & \(55.0\%\) \\  & & & \(4=\) Buggy & \(7.4\%\) \\  & & & \(5=\) Large Passenger Truck. & \(16.5\%\) \\  & & & \(6=\) Other & \(1.2\%\) \\ \hline  & & & \(0=\) Improper operation of & \\  & & & the driver & \\  & & & & \(1.0\%\) \\  & & & & \(1=\) Oversed or & \\  & & & & overloading & \\  & & & \(2=\) Drunk or fatigued & \\  & & & & driving & \\  & & & \(3=\) Failure to give way as & \\  & & & & required & \\  & & & \(4=\) Hit-and-run & \(1.4\%\) \\  & & & \(5=\) Failure to follow signal & \(4.0\%\) \\  & & & \(6=\) Other Violations & \(59.1\%\) \\ \cline{2-5} Infrastructure Attributes & Collision Type & The types of participants in accident. & \(0=\) Single vehicle accident & \(6.8\%\) \\  & & & \(1=\) Person-vehicle accident & \(25.1\%\) \\  & & & \(2=\) Vehicle-vehicle accident & \(68.2\%\) \\ \hline  & & & \(0=\) Non-motor vehicle lane & \(5.6\%\) \\  & & & \(1=\) Motor vehicle lane & \(72.0\%\) \\  & Position & The location of the road cross-section of the accident. & \(2=\) Mixed lane of motor & \(13.9\%\) \\  & & & vehicles and non-motor & \\  & & & \(3=\) Other & \(8.5\%\) \\ \hline  & Crossing or not & Whether the accident occurred in intersections. & \(0=\) No & \(65.4\%\) \\  & & & \(1=\) Yes & \(34.6\%\) \\ \hline  & Functional Zone & Indicates if the crash occurred within a municipality & \(0=\) Urban District & \(57.1\%\) \\  & & & \(1=\) Suburban District & \(25.8\%\) \\  & & & \(2=\) Rural District & \(17.1\%\) \\ \hline  & & & \(0=\) Other & \(5.0\%\) \\  & & & \(1=\) Drunk Road & \(67.7\%\) \\  & Road Type & Route class of the On Road & \(2=\) Secondary and Tertiary & \(13.8\%\) \\  & & & Roads & \\  & & & \(3=\) Primary Roads and & \(8.0\%\) \\  & & & Highways, & \\  & & & \(4=\) Urban Expressways & \(5.5\%\) \\ \hline  & & & \(0\leq 20\) km/h & \(37.9\%\) \\ Road Attributes & Speed Limit & Authorized speed limit for the vehicle at the time of & \(12-04\) km/h & \(41.8\%\) \\  & & the crash. (km/h) & \(2=\) \(40-60\) km/h & \(10.3\%\) \\  & & & \(3=\) \(60-80\) km/h & \(8.4\%\) \\  & & & \(4\geq 80\) km/h & \(1.6\%\) \\ \hline  & & & \(0=\) No Isolation & \(68.9\%\) \\  & & & \(1=\) Isolation Only Between & \\ Physical Isolation & The type of physical isolation facilities set up at the point of accident. & Motor and Non-motor & \(2.3\%\) \\  & & & Vehicle & \\  & & & \(2=\) Only Central Isolation & \(22.7\%\) \\  & & & \(3=\) Full Isolation & \(6.1\%\) \\ \hline \end{tabular}
\end{table} 
Table 1: Variable summary.