“For the Festival they have to straighten the starts so they are not coming in off a bend because the horses on the outside have to come in faster than those on the inside”
Spot on. Simple physics, a child could understand. The Household Cavalry and the RCMP have a wheel as part of their musical rides. 1:04 inthe video below- the inside horse is walking slowly , the outside horse is cantering, and each spoke is only 8 horses wide: