The R315 is a Regional Route in South Africa that connects Yzerfontein on the west coast with Malmesbury to the east.
Map of R315, South Africa
From Yzerfontein, it heads east. It crosses the R27 to reach Darling. At Darling, it meets the R307 and becomes co-signed with it heading south. Just south of the town, it diverges, again heading east. It ends in Malmesbury at the N7.
References
R315 road (South Africa) Wikipedia(Text) CC BY-SA