The cost of motor-truck operation is divided into fixed charges and operating expenses per mile. Assuming that a carefully trained driver has been obtained, the problem becomes one of securing better results. As a means toward accomplishing this, bonus systems are discussed and the development of a bonus system is analyzed mathematically and illustrated by charts. A typical application of the bonus scale is then made in detail, followed by full consideration of charge rates and combined time and mileage charges. The features involved are illustrated in the charts presented, an exposition of these being given in the text.