Impact level

Speed of saturation flow (km/h)

Headway of saturation flow (s)

Saturation flow (puc/h)

Reduction to the saturation flow (%)

Level I

<18.0 km/h

2.36 ± 0.15

1525

15.7%

Level II

18.0 - 19.8 km/h

2.23 ± 0.10

1614

10.7%

Level III

19.8 - 21.6 km/h

2.11 ± 0.07

1706

5.8%

Level IV

>21.6 km/h

2.05 ± 0.05

1756

3.0%

No effect

23.0 ± 1.5 km/h

1.99 ± 0.05

1809

-