I don’t know the whole story but this happened about 5-months ago.

Trump said in a Truth social post Monday night that he wouldn’t allow the bridge to open “until the United States is fully compensated for everything we have given them, and also, importantly, Canada treats the United States with the Fairness and Respect that we deserve.” Trump suggested the U.S. should take an ownership stake of at least 50% in the bridge and said that U.S. products, such as steel, weren’t used in the construction.

https://www.msn.com/en-us/politics/international-relations/what-is-the-gordie-howe-bridge-and-why-is-trump-threatening-to-keep-it-shut/ar-AA1W4VSa

A wall/shelf that mimicks the staircase but goes in the opposite direction so you have safety but its still pretty open? The backside of it could just be narrow boards.