aren't allowed to make U-turns if a 'No U-turn' sign is displayed. Making a turn over a no-passing line You can cross over the solid yellow no-passing line (if it is safe to do so) when making a turn to enter a driveway or side road. However, bear in mind that no-passing lines are often marked where visibility is limited, so special care is required. It may be safer to turn further along the road, where visibility is better. See Passing for more information about no-passing lines.