In terms of offering infinate tracks options a setup like Stotfold seems great to me...a large area of astro'd surface, with various shapes and features underneath...
No hard features at all like walls, so nothing to hit, and you could literally lay the track markings anywhere you like in the space and use the shapes totally freely.
Although I can see that some shapes would always lend themselves to being run in certain directions, particularly where they are shaped for big jumps and landings, it does offer maximum flexibility!
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