While a motor grader is traditionally for grading unpaved roads. The aim of grading is always to restore or maintain what is called "road geometry," or the necessary cross-section for a functioning unpaved road. Gravel roads are usually maintained by routine blading and adding gravel where necessary, but sometimes major grading and reshaping is necessary due to prolonged wet weather or unusually heavy traffic. Significant rutting, loss crown, and deep ditches are all circumstances that necessitate more substantial repair work.