Hitting and taking down trees, particularly the one included in the screenshot provided, causes a minimal speed loss ( 6-12 km/h ), regardless of speed at which you hit the tree in question ( 5 to 80 kmh/h). Speaking of this medium size tree, if anything, there should be a harder impact with greater speed loss, perhaps limited damage, but in general all trees apart from the bigger one, are too "light" {F20340}