Was driving behind this bakkie in the fast lane on R57 highway towards Sasolburg and he purposely drove on the far right of the road where there was gravel and stones came flying towards my Windscreen and cracked it. He then took the Vaal Park offramp and i followed him, we got to a stop street, i asked him why he did what he did, he started swearing at me and he just sped off. Will have to get a new windscreen now because of him.