27.7 Any driver defending his position on a straight, and before any braking area, may use the full width of the track during his first move, provided no significant portion of the car attempting to pass is alongside his.
27.6More than one change of direction to defend a position is not permitted.Any driver moving back towards the racing line,having earlier defended his position off-line,should leave at least one car width between his own car and the edge of the track on the approach to the corner