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According to some brief research, the accelerometers are set to close the contact switch (and do some azide chemistry!) when they feel a collision force equivalent to running into a brick wall at 10-15mph (16-24kph). Even though you were traveling at 20mph, your impact was with a movable object traveling orthogonal to you. My newtonian physics is a bit rusty, but I would venture a guess that the forces involved are significantly less than running into a brick wall, or head on into another vehicle.
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