The C13 is untarred except for several interrupted stretches between Aus and Rosh Pinah which were established to test the reduction of dust exposure due to heavy traffic on this road, caused by trucks to the mines at Rosh Pinah. The section between Aussenkehr and Rosh Pinah has the additional designation district road DR 212. During the raining season this section is often in a bad condition,[2] and sometimes altogether closed if the water level of the Orange River is too high.[3]