Three traffic signals - one on each side of the road, and a third hung from a mast arm overhead - which change from red to green and back again in sequence.
The A5109 enters from our left, having travelled from the fairytale-sounding districts of Totteridge and Whetstone. This junction is just a short distance before the next roundabout, which is also signalised - you should get used to traffic lights from this point on.