Test Scenarios
The national and international legislation presented in the previous section includes test or traffic scenarios that must be complied with. One of these scenarios is the so-called "cut-in manoeuvre", exemplified in the figure above.
“Collisions with traffic participants travelling in the same direction and entering their own lane shall be avoided within [...] certain conditions. [...]"
“Collisions with cutting in vehicles, pedestrians and cyclists travelling in the same direction, as well as with pedestrians who can start to cross the street, shall be avoided at least within the conditions determined [...]”
Based on a mathematical relationship that is identical for both regulations, a requirement for safe collision avoidance results when a vehicle enters its own lane above the TTC values below.
| TTC-Value: | Time to collision (TTC) at the time of intrusion into the lane of the motor vehicle with autonomous driving function in seconds. Penetration is defined as exceeding the outer edge of the barrier by more than 30 centimetres. |
| vrel: | Relative speed between the fully automated vehicle and the incoming vehicle (positive, if the ADS vehicle is faster than the incoming vehicle). |
The table below shows examples of speeds in 10 kilometre per hour increments.
| Relative Speed in km/h | TTC-Value in Seconds with Vehicle Occupants Standing | TTC-Value in Seconds for other Motor Vehicles |
| 10 | 0,74 | 0,48 |
| 20 | 1,32 | 0,71 |
| 30 | 1,90 | 0,94 |
| 40 | 2,47 | 1,18 |
| 50 | 3,05 | 1,41 |
| 60 | 3,63 | 1,64 |
Quelle: AFGBV Anlage 1 Teil 2 Abs. 10.2.5 und DVO (EU) 2022/1426 Anhang III Teil 1 Abs. 1.4.2
In the cut-in scenario shown above, there is no collision. This means that the vehicle complies with the corresponding requirements from the national and international regulations. These state that at a relative speed of 20 km/h, safe collision avoidance must occur above a TTC value of 0.71.