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This study comprehends the stability assessment of seven slopes with Pre-Cambrian rocks and located in traffic-access areas of SW Angola, one (Slope 1) is located on the road access from Lubango to Tundavala Gorge, another slope belongs to the Caholo?s area near Humpata (Slope 2) and five of them (Slopes 3 to 7) are located on the Leba?s Sierra, along the sinuous hair-pinned sections of the National Road 280. Slope 1 is composed by quartzites, volcanic rocks and lutites. Slope 2 shows sandstones, lutites and quart...