Abstract
ABSTRACT This paper presents a literature survey concerning the deterioration and rating of gravel roads. The methods for rating gravel roads in Sweden, Finland, Canada, USA, New Zealand and Australia are critically studied. The results show that a combination of traffic-dependent, geometric and physical factors govern deterioration, which in turn may lead to inadequate drainage capacity, potholes, rutting, corrugations, dust, loose gravel and frost damage. The literature review shows that the types of distress and the number of condition classes vary between different countries. Subjective assessment of road condition based on both verbal descriptions and photographs has traditionally been the method of inspection. On the basis of this literature study, a number of elements applicable to a new rating method are listed.
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