I think #1 and #4. If it's "greetings from the road", then I think just having a beautiful stretch of road with great background scenery as in #1 would be enough. The scene itself and road is welcoming and "greeting" and would put the fire in anyone to get out there and travel it.
Then, you have #4 which does not have the same beauty of scenery as the first, but the rider on the road looks like such a stock photo that i could see used in that way especially for that theme. The two compliment eachother as well by one have the beautiful road and scene and the other showing the rider who may be riding into that wonderful scene in #1.