Are ya thinking the judge should've ruled differently (for similiar reasons), or the same for different reasons?
You seem to be equating traffic laws with environmental protection regulations, or the need for the Republic to be self sustaining in the event of a national EMP.
After all, the Constitution is a living document - produced by a bunch of ignorant agrarians - having no clue to today's contemporary issues, the documents nees a bit of tweaking by the judiciary now and then.
I think in this case the Constitution says the state of Kentucky can tell them they have to have that yellow triangle if they want to, and always has.