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By being packed with explosives. The video of the inspection of the truck before it crossed the bridge shows a not very thorough inspection and it was not X-rayed.

Also the underside of the bridge is untact as far as burn mark go.

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And in terms of timing, even if the driver was unaware (i.e. wasn't a voluntary suicide mission), all it would take is a radio detonator and someone watching from afar with a telescope, if not a drone.

Ah true, I had assumed that the inspection would be a lot more thorough given the propaganda significance of the bridge.

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