1. Here is a suggestion for a sign style; cut away images in steel. The steel will be rusted to a controlled warm orange, then sealed to preserve it. It will be plasma cut, from a fairly thin gauge. Unlike the current signs, there would only be one per side. In this style, any image could be used.Boys on the Viaduct, c.1909:
2. My favourite is the ribbon form. It is a river, a ribbon (like the ones on the Q, and the installations at JS park) and it suggests the letter ‘R’. It would be constructed simply from 3 pieces of steel, securely anchored to the pole, and connected with bolts that would reference the bolts on the bridge.
The Ribbon form can become more elaborate or take on a more clear “R” shape: