In 1980 'Youngline' takes a look at the technology behind how traffic lights work.
Conor McAnally visits various traffic light locations around Dublin and with the help of a technician explains how traffic lights are used to control traffic flows and facilitate pedestrians.
An induction loop system on most roads acts as a metal detector which sends a signal to a traffic control box. Radar systems are also being tested to detect traffic and pedestrians. The signals are processed by a control box where a request is made for the lights to change colour.
A 'Youngline' report broadcast on 21 January 1980.
Traffic Light Controls