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Putrajaya Traffic Signal Control System
The system that has been used for the traffic signal control in Putrajaya is known as ITACA.
| What is ITACA?
ITACA - An Intelligent Traffic Area Control Agent. It has an Adaptive Subsystem that operates with a traffic model and produces Cycle Split and Offset times for a centralized area of traffic control. These times minimize delay and stops of traffic moving in the area.
ITACA provides real time urban traffic control by computing the best solution for every intersection and continuously adapting signal sequences to match traffic demand.
The ITACA Intelligent Adaptive Traffic Control System uses real time traffic flow data, obtained from detectors located in the field, to model traffic line-ups at every stop line. It then continuously adjusts traffic signal parameters (cycle, split and offset) at every intersection in order to minimize the number of stops and delays throughout the street network within the ITACA system's control.
The system produces small and frequent changes in traffic control parameters that smoothly adapt the traffic control plan to evolving changes in traffic demand. In this way, the negative effects on the network that otherwise would be caused by plan changes - such as flow disturbances and time delays in re-establishing flow - are avoided.
| Current Operation
Currently there are 128 number of junctions that had been installed with traffic signals in Putrajaya. There are junctions that are fully operated, while some were operated in ‘Flashing Amber' and a few others are still under construction (ducting and cabling works in progress). Refer Drawing 1.
| Putrajaya Road Speed Limits
The Putrajaya Road Speed Limits was amended in 2008 through the Speed Limit (Federal territory of Putrajaya) (Amendment) Order 2008(Perintah Had Laju (Wilayah Persekutuan Putrajaya) (Pindaan) 2008) at four locations/roads as following:
| No | Location/Roads | Original speed limits (km/j) | New (amended) speed limits (km/j) | | 1. | Persiaran Utara | 70 | 80 | | 2. | Persiaran Timur | 70 | 80 | | 3. | Persiaran Sultan Salahuddin Abdul Aziz Shah | 50 | 60 | | 4. | Lebuh Perdana Selatan | 50 | 70 |
| | Like any other territories and cities in the world, failing to obey the speed limit on Putrajaya roads is an offence as subject to Malaysian Road Safety Act 1987, which can be fined up to RM300, depending on the difference between the speed limit and the driven speed. |  | | Drawing 1 |
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