If you are lucky enough to be visiting a reserve that has Rhinos be sure to keep a safe distance, as their eyesight is not good and although usually if they approach you it is due to curiosity, they can reach speeds of 50kph when charging and change direction quickly. Mothers with young calves are very protective and we were recently charged by a Black Rhino that we had not realised had a small calf with her because it was shorter than the grass surrounding it. We always make sure we are in a position to drive away quickly should an animal look agitated, and try not to let it get ahead of us as reversing at high speed can get messy ! It is also a good idea to close all your windows if they do come close so that they cannot smell you.
As with all wildlife - respect their space, don't stay with them for long or disturb them, and should they start to pace or look agitated in any way, leave.
Three White Rhinos in grasslandThree White Rhinos standing in savannah in the Northern Cape, South AfricaBlack RhinocerosA lone adult Black Rhinoceros in grassland in Southern AfricaWhite RhinocerosWhite Rhinoceros crossing road in Southern African savannaBlack Rhino and calfBlack Rhino and calfWhite Rhinos WalkingA pair of adult White Rhinos walking in savanna in Southern Africa