Abstract: A saw blade for a sawing machine for cutting micro trenches for receiving at least one duct or cable. The saw blade includes coding elements such as holes, depressions or protrusions. The holes, depressions or protrusions form at least one code symbol representing a unique identity (ID) for the saw blade.

Abstract: A method for placing at least one duct/communication cable below a road surface in an area. The area comprises a first layer and a second layer, the first layer being a road layer, such as asphalt or concrete, and the second layer being a bearing layer for the first layer and being located below the first layer. The method comprising the steps of cutting a micro trench in the area through the first layer into the second layer, placing at least one duct/communication cable in the micro trench so that that duct/communication cable is placed below the first layer, and filling the micro trench so as to restore the road surface.