This paper descriptionbes a methodology for calculating the traffic volume on rural roads during any of the thousand highest hours of the year. The methodology entails the estimation of the average annual daily traffic (AADT) and a peaking characleristic. The paper also shows how this peaking characteristic can be derived from data obtained from permanent traffic counts. It has been found that the peaking characteristic is related to both K (the fraction obtained by dividing the volume during the 30th highest hour by the AADT) and the average length of through trips on the specific road section. It is hoped that this methodology will establish a firm foundation for further research into traffic volume variations and design hour volumes.
The Republic of South Africa is one of the few countries in the capitalist world where road and bridge work is stili being undertaken departmentally on a reasonable scale. In this paper a comparison is made between departmental and contract cost in the Transvaal Roads Department for the period 1975/76 to 1984/85. To make such a comparison possible, common units of measurement must be determined and furthermore all indirect and overhead cost must be identified and must be allocated to the relevant unit cost. The methods whereby this is done are descriptionbed in the paper.
The opportunity to co-operate and serve as a technic assessor on the hydraulicdesign aspects of the Misicuni Project in Bolivia led to the writing of this Technical note on the tasks participated in and the experience gained in South America in 1985.