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And the way these cars are built today they sit very low to the ground so the pre-stage and staging beam have to be fairly low so the front end does not trip it. (not sure what the standard height is).
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Ground clearance is required to be a minimum of 3". Stage beams are roughly 1-5/8". Yes, transbrake cars can back out of the beams. It happened in Super Comp at Gainesville last weekend, and it was recognized for what it was. That is a different animal. Again, all of these videos of similar incidents show the red-light coming on BEFORE the pre-stage and stage lights go out. Additionally, one of the examples of this phenomenon was with a footbrake car that staged at a low rpm and then came up on the converter, which results in the car moving forward slightly in the beams. While red lights are possible by rocking back out of the beams is possible on systems not utilizing Stagelock, this is demonstrably a separate issue.