Various road surface cutting apparatus are known for cutting or slotting asphalt, concrete and like road surfaces. With portable rotary power saws where users need to adjust cutting depth as well as maintain their grip on the apparatus. However, such road cutting apparatus do not effciently conduct substantial cuts quickly. Portable hand held cutting apparatus just do not have the size to support a power source or engine which can carry out large cutting tasks. Various self-propelled road cutting machine are known.