You may also consider the intensity of traffic or how active the road is or not. We thought so easily.

But behind the work, scientific analyzes, information and special algorithms appeared.

What are traffic lights set compared to?

Many factors are taken into consideration when determining the customs of traffic lights.

• Vehicle density and traffic volume
• Pedestrian traffic
• Junction geometry and width of roads
• Changing traffic flow compared to the time of the day
• Prevention of accidents and blockages
• Providing synchronization in the middle of traffic lights

Especially in big cities, traffic lights are dynamically managed with smart systems instead of working on fixed time. Well, how does this process work?

How are traffic measurements performed?

Let’s get a little more detailed, the rest of the formula will come. In the contemporary traffic administration, the traffic flow in the region is analyzed in detail before the period of the period of lights is determined.

Magnetic detectors placed on the roads, counting passing vehicles measuring the traffic density. Especially in places close to intersections, the Green Light Mühlet, which is compared to the data coming from these sensors, can be dynamically increased or reduced.

In addition, advanced traffic administration centers are also followed by cameras placed on intersections and follows the vehicle density instantly and thanks to artificial intelligence -based systems, the light period can be changed in accordance with the traffic flow.

In addition, the anonymous data from applications for Google Maps and Yandex navigation, which hours of traffic determine where heavier. In line with the information, the traffic lights can be optimized.

How are green, yellow and red light calculated?

We came to the formula we are talking about. It is based on a certain equation how much traffic lights will be burned and it is called the “Webster Formula ..

Green light time

C: (1.5L + 5) / (1 – Y)

• C, signal cycle period. (Total time for a light to turn from red to green and again to red)
• L, lost time. (Delay occurred during the stops of vehicles stopping and moving again)
• Y, the ratio of vehicles coming to the intersection.

Although it varies compared to the density of the vehicle and the number of lanes at the intersection, the green light is between 60 and 120 seconds. In places where there is heavy traffic, it can be long for more vehicles to pass and it is determined as 90 seconds. In less congested areas, this respite is kept in a border with 3-45 seconds.

Yellow light time

The period of yellow light is also calculated to keep the drivers in a faithful form. It changes in the middle of 3 to 5 seconds and is set at the end of the junction, depending on the size of the intersection.

If the yellow light sequence is too short, the drivers may have to brake suddenly, and if it is too long, the traffic flow can become without system.

Red light time

The red light period is calculated by the ambition to regulate the traffic flow and to recognize enough time for pedestrian transitions. It is set compared to a certain formula to avoid accumulation at the intersection and wait for the order of other ways.

In this process, the walking range is often determined as 7 seconds. The density changes the number of lanes, but the average is 7.

Smart Traffic Lights and New Belt Systems

Today, traffic administration has now evolved from fixed -time light systems to smart systems. Thanks to smart traffic lights:

• Compared to the real -time information analysis, light letters can be changed.
• When the emergency vehicles (ambulance, fire brigade) approach, green light can be given automatically.
• The systems in which pedestrians can affect the light response by pressing the button are becoming widespread.
• Thanks to artificial intelligence and machine collection -based algorithms, traffic flow becomes more efficient.

Especially in large cities, green wave application is synchronized with the traffic lights and the vehicles that are at a speed are always allowed to progress in green light.

As a result, traffic lights are not set compared to bahta, but also to science. If you can’t wait to wait at the red light next time, remember that it is not random and complex calculations are made in the Art Plan!

Would you like to know the reasons for these on the way to the road?