Adaptive traffic control conceptually can better handle real time traffic flow
fluctuations and significantly reduce control delay. There are two major types of
adaptive traffic control systems. UTCS, SCOOT, and SCATS are typical examples of
the first type of adaptive traffic control systems. The rest of the adaptive traffic signal
control systems reviewed in this chapter can be generally classified as the second type.
The first type of adaptive traffic signal control systems still has fixed cycle length, phase
duration, phase sequence, and offset within short time periods. The control systems
adaptively adjust these parameters based on real time or projected traffic conditions, and
the parameters are updated every a few minutes to avoid disturbing normal traffic
operations.
Adaptive traffic control conceptually can better handle real time traffic flowfluctuations and significantly reduce control delay. There are two major types ofadaptive traffic control systems. UTCS, SCOOT, and SCATS are typical examples ofthe first type of adaptive traffic control systems. The rest of the adaptive traffic signalcontrol systems reviewed in this chapter can be generally classified as the second type.The first type of adaptive traffic signal control systems still has fixed cycle length, phaseduration, phase sequence, and offset within short time periods. The control systemsadaptively adjust these parameters based on real time or projected traffic conditions, andthe parameters are updated every a few minutes to avoid disturbing normal trafficoperations.
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