I have a torn ball joint boot on my old VW:
I'm away from home, and ideally I'd drive back the 800km/500mi and change it then. The ball joint doesn't otherwise seem to have excessive play (the car recently passed its annual safety inspection), the only problem is the torn boot.
Am I safe to drive it back home like this? It's a smooth highway all the way. I don't care about any further damage to this ball joint, I'll be fitting a new one - I'm only concerned about safety.