Additionally, water helps control the dust created. In order to control the depth, slopes, and profile of the final milled surface many millers now have automatic depth control using lasers, string-lines, or other methods to maintain milled surfaces to ± of the target height. Micro milling Micro milling is also known as carbide grinding. It is a lower cost alternative to diamond grinding of pavement. Micro milling uses a specialty drum with three to four times as many cutting teeth than a standard milling drum. Micro milling can be used either as the final surface or as a treatment before applying a thin overlay. Micro milling can be used to remove many of the same distresses that standard milling can remove, although usually to a shallower depth. A micro milled surface has a uniform finish with reduced road noise compared to standard milling. References External links Asphalt Recycling and Reclaiming Association Engineering vehicles Road construction