Actually, nowadays, concrete roads are one of the most unpopular options. It's not that practical, and it depends too much on the weather and the thermal amplitude. I mean, the bigger the temperature difference is during 24 hours, the faster the road will get broken, which is not that great. Besides that, sometimes, even the best mechanics and engineers cannot tell you how long for concrete to dry, especially if you are making a concrete road that has to to be put into operation at a certain time.