Need Help with Road Surface

Hi, I made a little image for fun but I am not happy with the road surface (too smooth). I want to add a “bump” or another “texture” to the surface. Problem is when I created the texture I didn’t create a “mixed material”. Can someone please tell me how and where to add the node to add another bump or texture to the road surface. Thanks.


the blue input on the Glossy node.

hope this helps you:D