Perpustakaan Digital ITB

The major weaknesses of traffic controllers in Indonesia are unable to accommodate the variety of traffic volume and unable to be coordinated. To solve the problem, a pre-timed and coordinated traffic controller system is built. The system consists of a master and a local controller. Each controller has a database containing signal-timing plans. To synchronize the signal-timing, the master controller sends the synchronization data to the local controller wirelessly, and the local controller can modify a cycle length by adding or subtracting the green interval of any phases. The transition time for synchronization only takes one to several cycles. The algorithm for controlling the traffic including coordination can be done by an AVR microcontroller. Memory usage of the microcontroller is lower than 10%, meanwhile the CPU utilization is no more than 1%, and thus the systems could be widely developed.