|
|
|
In this section |
The Green Link Determining (GLIDE) System controls all traffic signals along arterial roads. As traffic flow changes, it responds by adjusting the green time accordingly.
GLIDE also links traffic signals at neighbouring junctions so that motorists can travel from one junction to another with minimal stops.
GLIDE also links traffic signals at neighbouring junctions so that motorists can travel from one junction to another with minimal stops.
What are the benefits of GLIDE?
GLIDE provides these benefits for road users:
- Allocates green time for motorists and pedestrians based on demand
- Provides "green wave" link between adjacent junctions to minimise the number of stops by vehicles
- Allows traffic signal faults to be rectified quickly
How does GLIDE work?
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.
|
|
How vehicles are detected
Detector loops are laid beneath the road surface of junctions to sense the presence of vehicles. Each time a vehicle moves over the detector loop, 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. These 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 often at the red light.
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 often at the red light.
Last Updated: 18 December 2007