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The Green Link Determining (GLIDE) System controls all traffic signals in Singapore. As traffic flow changes, it responds by adjusting the green time accordingly.
GLIDE also links adjacent traffic signals to allow vehicles to travel from one junction to another with minimal stops.
The GLIDE system detects the presence of vehicles and pedestrians at the junctions of major roads. It allocates green time based on the traffic volume in each direction
Wire sensors are placed below the road surface at the junction area to sense the presence of vehicles
How vehicles are detected
Wire sensors are laid beneath the road surface of junctions to sense the presence of vehicles. Each time a vehicle moves over the sensor, it causes a change in its magnetic field. This change activates a local controller which in turn adjusts the traffic light timing so that more green time is given to the direction with a higher traffic volume.
How pedestrians are detected
The GLIDE system tells the presence of pedestrians through push buttons, placed at traffic signal poles. Pedestrians have to press the push button before the green man will appear.
Previously, the green man would appear at a fixed time, whether or not there are pedestrians crossing the road. This means motorists have to wait at the red light unnecessarily.
Those waiting woes are a thing of the past as the green man now appears only when pedestrians press the push button. Motorists are also given more green time when there are no pedestrians crossing the road
Linking green time at adjacent junctions
The GLIDE system links the traffic signals at adjacent junctions, coordinating the start of their green times. Hence, motorists can catch the "green wave" and travel from one junction to another without having to stop as often at the red light.
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