HSIS Variable Name | Name Interpretation | Variable sub Classification | Mean | Standard Deviation |
Rd_char | The characteristics of the road section where the crash occurred | 1―Straight 2―Upgrade 3―Downgrade 4―Horizontal curve | 1.662 | 1.097 |
Rdsurf | The condition of the road surface where the crash occurred | 1―Dry 2―Wet 3―Snow, muddy | 2.396 | 0.831 |
Weather | Weather conditions when the crash occurred | 1―Clear 2―Rain 3―Snow, sleet 4―Fog | 1.533 | 0.803 |
Light | The type of light existed at the time of the crash | 1―Daylight 2―Dark,Lights On 3―Dark, No Lights | 1.642 | 0.69 |
Drv_age | The age of the driver of the vehicle involved | 1―< 21 years 2―between 21 to 65 3―> 65 years | 1.733 | 0.565 |
Drv_sex | Sex of the driver of the vehicle involved | 1―Male 2―Female | 1.401 |
0.49 |
Vehtype | Type or body of vehicle involved in the crash | 1―Passenger Car 2―Van or Minivan 3―Bus 4―Truck | 1.174 | 0.584 |
AADT | Annual Average Daily Traffic of the road section where the crash occurred | Numeric values in 1000s of vehicles. Min. = 5.70 Max. = 27.618 | 13.027 | 5.499 |
Sec_leng | Section of the road where the crash occurred | Numeric values Min. = 0.2 km Max. = 0.9 km | 0.518 | 0.204 |