In late April 1983 a friend and I were travelling from Cape Town to Johannesburg.In the early hours of the morning we were in the Karoo Desert [travelling direction NE] when an intense,silent light streaked over our vehicle [travelling direction SW],eventually disappearing over the horizon .We both considered the possibility that we had witnessed a UFO.The following day The Star newspaper [Johannesburg's daily] reported that others on the road had witnessed this occurence and that there was no plausible explanation.This is my only defacto UFO sighting and it's still a mystery.Observers were both electronic apprentices in the South African Air Force.