Above a flow of around 3,600 pcu/hr (passenger car units) per lane, the roundabouts does not balance each direction effectively. (No gaps). Traffic lights (sig

Above a flow of around 3,600 pcu/hr (passenger car units) per lane, the roundabouts does not balance each direction effectively. (No gaps). Traffic lights (signals), can help improve flow further in these situations as well as giving pedestrians a safe way to cross. Part-time signals (only on a peak) can be very effective.