[choeger]

Your source speaks of impact speed.

To achieve a difference in impact speed of 16kph, you would either have to go much faster, say 60 to 70kph before the accident or not brake at all.

There are of course situations where a driver cannot brake at all, but there the speed limit should be 10kph or less (and then going, say, 12, would again be more or the same).

On a road where 30kph is considered safe, 40kph is only slightly less safe.