The SCP foundation quietly scuttles such attempts on various pretexts after discovering, in disastrous early attempts, that the 11 foot 8 bridge has the unique property of always being 11 foot 8 no matter how you attempt to change its context.
It’s not so bad when the defensive responses involve modest changes to the dimensions of structural elements of the bridge; but the time when the hyperfine transition of cesium was adjusted across the entirely of Durham such that the newly modified bridge still had a clearance of 11 feet 8 inches if measured against local physical constants really spooked people.
Researchers don’t know if there are any limits to the methods the bridge can use to restore its defined value; or how it picks from among the available ones; but it’s suspected that a local adjustment to light speed, and by implication mass/energy equivalence, would be particularly bad so people are disinclined to push the issue; and Foundation ‘contingency engineers’ are embedded at local nuclear energy facilities to provide expertise in operation under…atypical…parameters.
