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It took Lawrence Livermore Labs to come up with this? The thing about a truck's air brakes is that they operate when NOT pressurized. That makes forcing them on pretty simple.
The people worried about deliberate or accidental activation are right on -- imagine your bad guy "accidentally" rear-ending a half-full gasoline tanker on, say, the PA turnpike. Instant jackknife, roll, gasoline spill, fire, maybe explosion.
Now forget about him and consider all the idiots who might REALLY accidentally rear-end a tanker, changing a minor incident that the tanker driver might not notice into a major disaster.
As for tamper proof... uhh, yeah, right. Close off and bypass the lines that lead to the device, and it does nothing to the air brakes. Mechanical emergency brakes? If you're a terrorist, just remove them entirely.
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