Hi Richard - these aren't bad at all. I'm certainly no expert, but in my view (for what it's worth!) the best are 4 & 5 as your panning is really good. I like the idea of framing the trucks under the bridge in no.1, no. 2 is a great pan, but I would have cropped a bit to take away some of the space above and below the truck. In no. 3, the background is distracting from another really good pan, while 4 & 5 are excellent in my book...personally I'm not mad about the fence in 5, but that can work sometimes and others might say that it adds something to your shot. Good shots overall.