| Driving situation | A user is running freely along the highway |
| Accident situation | He is at crossroad in front of a car in motion or willing to go back to the high way |
| Emergency | The surprised driver tries to stop or avoid the obstacle |
| The Shock | If the braking or avoidance maneuver is less than the distance of visibility then the shock is inevitable. |
| Accident factors | Failure of the highway code |