There doesn't appear to be any force pushing the rider to make a wider turn, this obviously happens on the flat and can also happen on less steeply banked tracks.
Objects in equilibrium (ie no net forces) continue to go in the direction and speed they were already heading. Forces are only needed to change direction.
There doesn't appear to be any force pushing the rider to make a wider turn, this obviously happens on the flat and can also happen on less steeply banked tracks.
Would R(v) be the force at play?