The route up Sani Pass starts at 1544 m, and climbs 1332 vertical metres to an altitude of 2876 m. The road is a steep gravel road with gradients up to 1:3, which can be difficult to drive in bad weather and may be covered with snow and ice in winter. By South African law only 4x4 vehicles are allowed on the road. Several tour operators run guided tours up and down the pass. The pass lies between the border controls of both countries and is approximately 9 km in length. Caution must be exercised and motorists must be alert while navigating the pass as it has claimed many lives. Occasionally the remains of vehicles that did not succeed in navigating the pass's steep gradients and poor traction surfaces can be seen.