ABSTRACT
The nature of the roads within the study area is variable, ranging from unsealed gravel roads to multi lane freeways. The predominant vehicle type on all roads are cars. The majority of roads in the study area are flexible pavements surfaced with either a sprayed bituminous seal and stone aggregate, or asphaltic concrete. Concrete roads become more economic with heavy loading and low California Bearing Ratio (CBR) and are increasing in application in private heavy duty pavement schemes, and major arterial roadworks. A data base from VicRoads has been used to assess the design CBR values which have been adopted within different geological units within parts of the study area. It is a common misconception of designers that density alone is all important to achieving maximum performance in a soil, whether it be to achieve performance based on CBR, strength, compressibility, permeability or other soil design parameters.
