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| No. | Variable | Feature | Description |
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| 1 | Road type 1 | Geometric design | Main, two-way, one-way |
| 2 | Road type 2 | Geometric design | Nonseparate two-way road/separate two-way with physical separator/One-way |
| 3 | Road type 3 | Geometric design | Freeway – highway – intersection – main street – side street – main road – rural road – side road – square – Turn |
| 4 | Time of crash | Time-related | Afternoon, morning, night, noon, sunrise, sunset |
| 5 | Road characteristics | Geometric design | Level difference between asphalt and shoulder – nonstandard transverse and longitudinal slope – nonstandard safety guard on the side of the road – lack of safety guard on the side of the road - lack of shoulder and parking – sharp angle arch – road subsidence – road marking defect – road lighting defect – road asphalt defect – defect of horizontal signs – defect of vertical signs - existence of an obstacle – narrow width of the passage - other – no defect |
| 6 | Lighting condition | Weather and environmental conditions | Day-night with enough light – night without enough light - sunrise – Sunset |
| 7 | Surface condition | Weather and environmental conditions | Waterlogged – wet-dry and normal – oily and dirty – sandy – bituminous – frost and snow – other |
| 8 | Shoulder condition | Geometric design | Asphalt shoulder – dirt shoulder – no shoulder |
| 9 | Sight obstacle | Geometric design | Panel – mound – tree and plant – building – slope – sandstorm – vertical arc – fog and smoke – sunlight – headlight of the vehicle in front – vehicle while moving – vehicle stopped – blizzard – frost glass of the vehicle – other –no obstacles. |
| 10 | Maintenance condition | Geometric design | Repair with adequate marks – repair without sufficient marks - not repaired |
| 11 | Road equipment failure | Geometric design | Passenger safety protection – road surface – signs – no damage |
| 12 | Land use | Land use | Educational-administrative and commercial-recreational-industrial-non-residential-residential-agricultural-other |
| 13 | Location of the crash | Geometric design | Main road – off-road – medium refuge – shoulder – roadside – Other |
| 14 | Weather condition | Weather and environmental conditions | Cloudy – rainy – snowy – clear – stormy – dusty – foggy |
| 15 | Geometric condition of the road | Geometric design | Tunnel – straight uphill – straight, downhill – straight, flat – bridge – uphill turn – flat turn |
| 16 | Sign condition | Geometric design | Double – cross section – continuous – does not have |
| 17 | Speed limits (Km/h) | Traffic attributes | (0–40)-(40–60)-(60–80)-(80–100)-(100–120) |
| 18 | Vehicle defect | Vehicle characteristics | Tire smoothness – lack of snow deflectors in case of emergency – suspension device defect – lack of wheel chains in case of emergency – brake system defect – lighting system defect - handling system defect – other – No defect |
| 19 | Effective driver characteristics | Driver characteristics | Drug use – tiredness and drowsiness – weakness due to old age – unhurried haste and acceleration – lack of familiarity with the road – lack of recognition of the right of way – alcohol consumption – effective organ failure – Other |
| 20 | Identified effective factor in the crash | Mix | Deviation to the right – deviation to the left – sudden opening of the vehicle door – exceeding the speed limit – violation to the left due to overtaking – sudden change of direction – reversing – moving in the opposite direction – pedestrian error – bypassing in a forbidden place – passing from the forbidden place – inability to control the vehicle – failure to pay attention to the front – failure to observe the right of way – failure to observe the distance –failure to observe the transverse distance – defects in cargo regulations – wrong turning – wrong towing – Other |
| 21 | The first part of the crash | Vehicle characteristics | Ambulance – bus – livestock – road construction equipment – agricultural equipment – tanker carrying hazardous materials – trailer – firetruck – police car – bicycle – riding – motorcycle – pedestrian – minibus – vantage – truck – Other |
| 22 | Points of collision of the first party of the crash | Vehicle characteristics | Front – front and rear – front and right side – front and left side – front, rear and right side – front, rear and left side – front, rear, right side, and left side – back – back and right side – back and side left – rear, right side, and left side – right side – right side and left side – left side |
| 23 | First party crash violation | Driver characteristics | Stopping off-road – stopping at the level of the road – sudden stop – moving forward – moving rear – drifting – overtaking – Sudden start – turning right – turning left – Other |
| 24 | Age of the first party of the crash | Driver characteristics | (0–18)-(18–40)-(40–60)-(60–80)-(80–120) |
| 25 | Gender of the first party of the crash | Driver characteristics | Male – Female |
| 26 | The second part of the crash | Vehicle characteristics | Ambulance – bus – animals – road construction equipment – agricultural equipment – tanker carrying hazardous materials – trailer – firetruck – police car – bicycle – riding – motorcycle – pedestrian – minibus – vantage – truck – truck – Other |
| 27 | Points of collision of the second party of the crash | Vehicle characteristics | Front – front and rear – front and right side – front and left side – front, rear and right side – front, rear and left side – front, rear, right side, and left side – back – back and right side – back and side left – rear, right side, and left side – right side – right side and left side – left side |
| 28 | Age of the second party of the crash | Driver characteristics | (0–18)-(18–40)-(40–60)-(60–80)-(80–120) |
| 29 | Gender of the second party of the crash | Driver characteristics | Male – Female |
| 30 | Pedestrian status as the second party in the crash | Driver characteristics | Off-road – getting on or off the vehicle – while pushing the vehicle – while working on the vehicle – standing on the side of the road – sudden running on the road – crossing the road from the permitted route – crossing road obstacles – crossing in the opposite direction of the vehicle – crossing in line with the vehicle – other |
| 31 | Familiarity with the road of the first party of the crash | Driver characteristics | Native/non-native/unspecified |
| 32 | Variables related to traffic volume | Traffic attributes | The volume of passing vehicles of class 12 – volume of passing vehicles of class 23 – volume of passing vehicles of class 34 – volume of passing vehicles of class 45 – volume of the passing of vehicles of class 56 – volume of the passing of heavy vehicles – volume of the passing of total vehicles – average weight of heavy vehicle traffic volume, medium heavy vehicle traffic volume, standard deviation of heavy vehicle volume, heavy vehicle traffic volume, minimum heavy vehicle traffic volume, maximum traffic volume of heavy vehicles, weighted average volume and transit traffic of all vehicles, average volume and transit traffic of all vehicles, standard error of volume and transit traffic of all vehicles, skew volume and transit traffic of all vehicles, minimum volume and transit traffic of all vehicles, maximum volume and transit traffic of all vehicles. |
| 33 | Headway | Traffic attributes | Weighted average headway of all vehicles, average headway of all vehicles, standard deviation headway of all vehicles, skew headway of all vehicles, minimum headway of all vehicles, maximum headway of all vehicles |
| 34 | Average speed | Traffic attributes | Average weight average speed of all vehicles, standard deviation average speed of all vehicles, skew average of speed of all vehicles, the minimum average speed of all vehicles, the maximum average speed of all vehicles |
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