You don't get "straight up" feathers - there'd be no route indication at all for the 'straight' (or fastest) route in that case.The light above the signal which shows the route set. Straight up - straight on; diagonally to the left - diverging to the left; diagonally to the right - diverging to the right. Driver needs to know as there may be different speed resrictions, and he will want to know that he's being sen t the right way!