A hypothetical traffic experiment

The currently sectioned off area of Lion Hill has both bright reflective barriers and a plethora of cones indicating its presence. On a purely hypothetical note I wonder what the effect would be if a couple of the cones were misplaced so as to sit on the cross-hatched area leading at the meeting of Worcester Road and Gilgal with Mitton Street so as to prevent traffic moving directly from one lane to the other as soon as they pass the splitter?