I've written before about the proposal by Gonzalo Camacho to rebuild I-45 from Beltway 8 to I-10 as a tunnel (see the PowerPoint presentation here, plus a Houston Press article with some clarifications by me). The project has been dubbed the I-45 Parkway, and there's now an I-45 Parkway website, with everything you need to know about it. I like the idea, I think it's worthy of serious study, and I invite you to see for yourself what it's all about.