They could have threatened the driver with killing his family or some other kind of blackmail, even if just to get him in the car while he was drunk or drugged up. And could have forced him into the accident by pressuring him from another car like chasing him down or tailgating him to make him speed. Then once in the tunnel, use that other car that supposedly created a paint scratch to cause the crash. It would be hard to avoid an accident, there's no where to veer off to.
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