Take a closer look at the photo. I have been in the building game on and off for most of my life. It seems they have laid straight over the old cobbles.The surface hasnt held, suprise, suprise.Well as a tarmac man myself I know it wont as the cobbles could never be even and never sound. Sureley the best method would have been to dig up the road put down hard core. Vibrate it create a level and a sound base and then Tarmac it. Then you dont have to keep coming back. I mean you could use the cobble stone for your hardcore. Cowboy council work I say.