The latest innovation from Siemens comes under the Plus+ banner and encompasses its third generation digitised traffic control system which features distributed intelligence and simplifies cabling. In place of up to 300 wire cores on a single signalised intersection, the Plus+ system uses just four cables arranged in a system of rings, arms and spurs. The four wires, two power (48V) and two data, are used to connect ‘intelligent nodes’ in each traffic light head to be connected to the central controller, re