B: To prevent queuing traffic from blocking the junction on the left
C: To mark the entrance lane to a car park
D: To warn you of the tram lines crossing the road
View hint
Yellow ‘box junctions’ like this are often used where it’s busy. Their purpose is to keep the junction clear for crossing traffic. Don’t enter the painted area unless your exit is clear. The one exception is when you’re turning right and are only prevented from doing so by oncoming traffic or by other vehicles waiting to turn right.