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' garage door '
The car would have to be on rail tracks, perfectly aligned with the garage door cased opening in order to achieve the sub-millimeter accuracy of the fiducial.
And then, the 'walls' would be obstructing the 'void' the 'arrows' poking through the bridge would normally be occupying.
We're talking about a Vernier caliper with a jaw opening greater than the width of car.
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