The coolest time to drive is to go all the way to the green light, unimpeded, and one foot on the accelerator to the destination; and perhaps the worst experience of driving is that no matter how you dodge, you are always locked in front of the red light.
You think it's a question of character? In fact, this is a mathematical problem full of probabilities, and it is also a problem in the field of operational optimization.
Magical green wave speed
Vehicles have a certain speed in the process of driving, and the process of changing the signal light and speed are inextricably linked.
When the driver maintains a certain speed on the smooth street, the traffic lights encountered at the intersection are most likely to be the same color.
If you want a green light, the method is actually very simple, just make the speed of the vehicle and the green wave speed of the signal light consistent.
Green wave speed is also called green wave belt, wave speed control or multi-intersection signal linkage, mainly designed in the road section with more intersections. The original design of the green wave speed by traffic designers is to make the signal light timing more accurate and more scientific, and to create a good road traffic environment.
I don't know if you have noticed, in the past two years, there are more and more digital traffic signs on both sides of the road, don't simply think that this is a speed limit label, it is likely that this number is conveying to you the "green wave speed" on this road.
When driving a vehicle on a section of the road with a specified speed, it is most likely to be unimpeded.
This is the signal control system adjusting the green light start time according to the distance of the road section, so as to ensure that the traffic flow meets the "green light" when it reaches the intersection. As long as the driver travels at a certain speed, he can go all the way to the green light.
Of course, the speed of green waves is set differently in different areas. If the speed requirement of a road section is 60km/h, when the driver passes the green light at this speed, as long as this speed is maintained, the next few traffic light intersections will be a green light.
If the speed requirement of this section is 50km/h, and the driver still maintains a speed of 60km/h, then the road is bound to encounter red light phenomenon; on the contrary, if the speed cannot be maintained in the morning and evening rush hours, the driver is likely to be unable to catch up with the green wave belt, resulting in the situation of "plugging up and blocking".
How the speed of the green wave is calculated
With the development and progress of the times, the number of private cars in the mainland is increasing year by year, in order to provide a better traffic environment, "green wave speed" came into being.
At present, all the main roads of the city have green wave speed behind the control, the speed is unified in 50-60km/h range floating, and now the traffic rules for convenient life also have cumbersome calculation methods behind them.
First of all, it is necessary to determine the range of the trunk road for green wave control, investigate the traffic flow of each intersection; then calculate the optimal signal timing and signal period of each intersection, and calculate an optimal period according to the results obtained, which will apply to all intersections of "green wave speed".
According to the distance between different intersections and the design speed of the road, the time interval between adjacent intersections to turn on the green light is calculated, and finally the most efficient traffic control method is obtained through repeated debugging.
If you look closely, you will find that the green wave speed is generally used on the trunk road from the central urban area to the outer urban area.
The purpose of this is to allow vehicles in the central area to drive out of the core area as soon as possible; and the corresponding road into the direction of the central urban area is often not set up with green waves, and even sometimes set up the opposite "red wave", the purpose is to let the vehicles entering the core area wait for the red light several times to alleviate the traffic pressure in the core area.
Internationally recognized road access manual research shows that the improvement rate of traffic congestion and delays at green wave speeds is as high as 20%, which is a positive feedback for both vehicles and traffic environments.
How the green wave velocity is controlled
At present, the commonly used green wave control on the road is mainly divided into one-way control and two-way control.
One-way control is mostly applied to roads with control needs such as one-way lines or morning and evening rush hour commutes. However, the drawbacks it brings are also relatively obvious, which may affect the effect of control coordination, and the probability of encountering red lights will be relatively high.
The other is the two-way control of green waves, intersection equidistant pavement generally uses two-way green waves, although the application effect is remarkable, but its application conditions are relatively harsh, most of the two-way green wave control needs to be achieved through phase splitting or phase overlap. Its disadvantage is that it introduces signal loss and can have an impact on the loss and delay of other uncoordinated vehicles.
Therefore, in the actual application process, the control mode of segmentation or intersection of the two will generally be adopted to coordinate the overall road situation and maximize the optimal solution of road traffic under the condition of controlling traffic costs.
With the emergence of technologies such as unmanned driving and automatic driving, the application of vehicle-road collaboration technology will continue to improve. In the future, we may achieve perfect travel through intelligent means. The imagination of the intelligent era may soon come true.