How could this happen...?
... I thought the barriers were strong enough to prevent such an accident.
Here's an interesting look at how the barriers are tested in the States.
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Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain
He who feared he would not succeed sat still
Re: How could this happen...?
Also if the post the barrier is affixed to is defective for some reason then it will not offer any resistance to a vehicle colliding with it. Add to that any previous damage from any other incidents..
The titanic was unsinkable but it sunk.
Encryption is unbreakable but can be decrypted.
Aluminium doesn't rust but instead it corrodes and goes a powdery white.
What I'm saying is that in an ideal world things don't go wrong but there is always a gotcha somewhere.