This is the most challenging roads or junctions in UK.
Because this road engineering designs for busy traffic in junctions, the challenges you have to solve comes from both busy traffic itself and the complicated rules applied in such junctions.
You will easily overwhelming with visual information in a extreme short time and limited space. Sometimes you are forced to decide to choose a lane with incomplete information, the satnav may not tell you which lane to go, the direction in satnav may not fully match in the road paintings, the road paintings may faded or covered by other vehicles, some of exits in roundabout may not easily count. The traffic sign or traffic signal may hidden by overgrown bushes in the road or roundabout island, and even the traffic light itself may in outage status. And the yellow box area combine with amber traffic lights may bring you in an awkward dilemma. Luckily it is rarely seen careless pedestrians and moped cyclists brutally cut in.