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The effect would be the same - if the two vehicles were of identical weight and construction.
Barrier impact tests are done against a solid immoveable structure (as was the wall in the tunnel), so no penetration occurs.
Like billiard balls, vehicles that are similar will 'bounce off' each other just as if they had impacted a solid wall.
The speed of impact doesn't double as you might think at first.
Think of it as approaching a ballistic mirror.
This was simply a 60mph (or whatever speed) barrier impact test . . .
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