To reduce vehicle damage, to protect an occupant, and to avoid a secondary accident and a fire by a rear-end collision by gradually absorbing and attenuating collision energy in a parabolic shape.

(1) A brake is applied while releasing the collision energy of a runaway vehicle by a guard rail attached with a roller having rotational resistance. In this case, (2) the guard rail attached with the roller having the rotational resistance of various optional shapes adjusted to a road condition such as a cylindrical shape, a spindle shape, a spherical shape and a doughnut shape, is laid on a road as a road side wall, a traffic lane median strip wall, a median strip and a sidewalk median strip wall.