The City of Tulsa is amending rules for its Route 66 neon sign grant program after several were fabricated and installed without neon tubing. According to News on 6 in Tulsa, those without neon were The Capital of Route 66, Big Dipper Creamery and Anybody’s Guest signs. The signs were made with a newer manufacturing practice of molded embossed material lit from behind, that mimics tubing, while traditional neon uses glass tubes lit from within, mounted above the surface of the sign.

There are about 30 mid-century neon signs remaining in Chicago — but no clear incentives for owners to keep them up when their small businesses close, preservationists said.