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The R399 is a Regional Route in South Africa that connects Vredenburg with the N7 between Piketberg and De Hoek.[1]
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| Location | ||||
| Country | South Africa | |||
| Highway system | ||||
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- ^ Falkner, John (May 2012). South African Numbered Route Description and Destination Analysis (Report). National Department of Transport. p. 107. Archived from the original on 6 June 2014. Retrieved 2 September 2014.