The Kakunodate-Matsuri, held in Akita, Japan, is one of the most game-like festivals in which the festival floats are repeatedly 'bumped' against each other in order to win the right of the way. We hypothesised that the accumulation of serious ingenuity by each community that has preserved and operated the floats to win in the 'bumping' might be reflected in the structural form of the floats themselves. To test this hypothesis, we constructed structural models of two floats, one new and one old and carried out collision simulations. As a result, it was confirmed that the floats, which tended to concentrate the impact force at the front of the structure during a collision, were modified to distribute the impact over the entire structure, preventing axle damage due to stress concentration and at the same time reducing the impact on the musicians on board in the middle of the float.