Steve, you are not perhaps one of the Marshalls at Kyalami - or are you still involved in racing of any kind ?
My daughter and son and law hired a house on an undeveloped land, just south, and not further than 300m from the Kyalami racetrack - untill about 4 years ago. When we visited my daughter, my son in law, and myself always visited the racetrack during weekends - when the racing guys were practising . We could never resist the temptation to visit the racetrack when we heard the noise of the racing bikes, when we were at home.
About four years ago my daughter and husband bought a house in Vorna Valley, not far from Kyalami, but unfortunately we cannot hear the noise of the bikes any longer - and my visits to Kyalami just became a memorable experience......