I'm no great fan of the selective desaturation technique, but here it's effective and useful - emphasise the curves.
I'd back up the point about the horizon line - it seems a little arbitrary to put it dead centre: if you could have got a bit higher and placed the horizon further up the shot there might have been even more impact.
The other down-side is tha amount of noise in the sky, and those big blurry lumps. I wonder if you've over-processed the shot, or cropped out too much for the resolution of your camera. Worth trying a programme like Neatimage, which is excellent at getting rid of just that stuff.
The space and emptines you've caught is excellent though, good work.
Nice composition but, to me, the yellow lines stand-out a little too much. It's almost like they were painted on afterwards, which rather breaks the mood of the picture.
I like the sparseness of this, just the road wrapping around into the distance, one truck. The road is crucial to transportation. I might crop out some of the sky. Wonder about the funny edges on the lines - the white line and the edge of the wall. Did you sharpen it too much perhaps?
Nice idea, but does not work for me. Prehaps if the truck was nearer and there were some dark heavy clouds in the sky it would make the picture a lot more emotive. (PS - looks like you have two smudges towards top center of the picture which could be dirt on your sensor - have not marked you down for these).
I think i'd crop a bit off the top and move the truck more to the left, but otherwise a very nice shot. Is this Lake Ponchetrain (sp?) headin' towards New Orleans?
Excellent. As a standard B/W or color this wouldn't be so special but desaturating all but the crisp and sharp yellow line is an excellent idea. Also a good choice to have this much DOF. I haven't rated all but so far this is one out of two for the first place.
Your use of gray and the yellow line is Freakin' Awesome! I really love your compsosition. I'm always so impressed when someone can take a boring subject and make it look cool. Nice job.