By way of comparison, the toy-size equipment on my layout barely overhangs the edges of the Fastrack at all, so it is essentially impossible to collide. As long as the tracks physically fit, I could probably consider them far enough apart. Beyond that minimum spacing, more space buys you more options to run whatever you want on whatever track you want whenever you want. The extreme would be a club setting, where this is exactly what happens. In a home layout, you probably want to be somewhere in the middle. Decide for yourself how much room you want to leave for the trains based on the space you have, what looks good, what you want to run, and the operational considerations mentioned above.
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