How do traffic lights work in Russia?

Question

Automation

Can you give me links or describe how city traffic lights work in our country? I understand that inside the piece of iron is an ordinary electromechanical relay. Interested in how we monitor their performance, manage them. Somehow, after all, a connection is established with them, somewhere they transmit data about their state? If not, then how do they generally change the duration of signals (better with technical details), how do they determine whether it is broken or not?

Answer 1

It seems to me that there is just a timer in the simplest case with segments of 1.5 minutes of a car + 30 seconds of pedestrians, and they determine when it broke down by a complaint call from grandmothers who are uncomfortable crossing the road.
No magic))

Answer 2

Electronics, in fact, as in the West:
It all depends on the required functionality, installation location and age of the system.
In very ancient and primitive traffic lights there is a relay circuit: some relays set time delays, others switch modes.
In younger ones, there is a microchip-logic circuit: in principle, it is the same as with a relay one, only delays and switching are set by logic microcircuits and timers. Here you can make simple adjustments such as mode changes during peak hours and simple "green waves"
In modern ones: a microprocessor system: microcontrollers already rule everything there. Here you can do whatever you want. such traffic lights, if necessary, are connected to traffic control centers and from there you can adjust their modes online, they also transmit their status and the dispatcher immediately sees what is not working.

Answer 3

On the example of St. Petersburg platniedorogi.ru/portfolio-view/dmitriy-popov-abou...

Answer 4

Interested in how we monitor their performance, manage them.

At the traffic light there is a sticker (in St. Petersburg) - "In the event of a traffic light failure, call by phone ..."

Answer 5

Automation is controllers, relays are only for load matching. Since the metro is a secret facility, the information on traffic lights is, if not secret, then at least confidential, so the protocols will not be easy to find out. Here are the elevators. You, too, no one will lay out the interface of elevator controllers. Or, let's say, take cars that use the CAN network. Some are trying to join.