Functions of signal controllers
Centralized signal controllers
These controllers use microprocessors and LSI especially for traffic control in hierarchical structure for improved reliability.
As well as managing the various sensor controls, the microprocessors also learn the remotely controlled cycles, split controls, and display changeovers. This prevents signal control disruption by ensuring the function continued even if there is a break in the traffic control center circuits.
This system is designed to continue safe signal operation even in the event of malfunction where the microprocessors are unable to actuate the traffic signal control LSI.
Multistage signal controllers
With a built-in universal calender, this device can flexibly program signal patterns for any given time slot on weekdays, Saturdays and Sundays.
Push-button signal controllers
These controllers activate green signals for pedestrians wishing to cross main roads-all pedestrians have to do is to press the button provided at the road crossing point. Normally the lights on the main roads are set to green, allowing vehicles to pass.