Why such a rush to The Wheel here? What will roads give you? They're a waste of time at this point. Generally, you should be putting roads off as long as possible. If you need the health or happiness bonus (you don't here), you build a road. If you need a road for a trade route between cities, you build a road. If you need to hook up a strategic resource (copper, iron, horses) for military development, build a road. And if your workers are idle with nothing better to do, build a road. If none of those are the case, odds are good that researching The Wheel is a waste of valuable beakers you could be spending elsewhere, and actually building the roads is a waste of valuable worker-turns you could be using to develop your empire.