174. Box junctions.   These have criss-cross yellow lines painted on the  road (download ‘Road markings’). You MUST NOT   enter the box  until your exit road or lane is clear. However, you may enter the box  and wait when you want to turn right, and are only stopped from  doing so by oncoming traffic, or by other vehicles waiting to turn  right. At signalled roundabouts you MUST NOT   enter the box  unless you can cross over it completely without stopping.  Law TSRGD regs 10(1) & 29(2)  highwaycodeuk.co.uk 92 