Roadway overlays includes the milling and re-paving of various streets within the City of Lethbridge.
Milling is when a grinding machine goes down the total length and width of a street and grinds 60 to 80mm of asphalt off the top of the road surface. The material that is ground off is reused by putting it back into the asphalt mix that is put back onto the roadway. This reused material make up approximately 14 % content in the mix design.
