A sign?
Hot dog: Semi truck carrying frankfurters catches fire on Dodge Expressway
Images later showed the semi trailer nearly completely burned, with the fire extinguished, as well as some close-ups of the cooked cargo:
https://www.omaha.com/news/public-safety/hot-dog-semi-truck-carrying-frankfurters-catches-fire-on-dodge/article_f8846fda-040e-5998-b304-09346cd65e88.html