Driving home during the Spring Festival, or going to the scenic spot to play, we must have been inseparable from navigation, mobile phone navigation has become our right-hand man for travel. Whether it's exploring unfamiliar routes or navigating heavy traffic, these smart tools have made it easier than ever before.
The familiar traffic light countdown function in navigation is very useful, which can predict the waiting time and remind the driver to be ready to cross the intersection in time. At the same time, the speed of the green wave section will be broadcast, and the speed of the car can be controlled according to the prompts, and the predicted traffic lights can be continuously passed. When the speed is too fast to reach a red light intersection, the navigation will also remind the driver, pay attention, pay attention to the red light ahead, please slow down.
With the traffic light countdown function, it's like a real prediction of the future, how does the navigation get the traffic light time? Many netizens think that the navigation software obtains the traffic signal data of the municipal road, so it can know the traffic light time of each intersection and realize the countdown function. At first, like everyone else, I thought that this magical function was realized through the traffic data of the road administration, but when I encountered the temporary signal lights placed at the intersection could also accurately realize the countdown, I realized that this perception of the Jedi was one-sided.
From the published patent information, it was found that the countdown function of the traffic light without network can be realized by collecting the data information of the navigation software user, and the time and interval of the traffic light can be calculated. The main purpose of the patent is to select a sample vehicle, and then calculate the offset time according to the first start time of the vehicle waiting for the traffic light vehicle through the intersection, and then calculate the offset time, etc., and finally comprehensively calculate the light change time of the traffic light. The system collects information such as the parking time and start time of the target vehicle during the time period, and then relies on massive user data for continuous correction to achieve the function of accurate countdown.
In actual use, not all intersection traffic light times are very accurate, and some also have delays or early ends, which should be caused by insufficient data sample size or inaccurate municipal data. With the change time of the traffic light, it is of great help to optimize the traffic, you can start the vehicle through the intersection faster, and you can also prompt the green wave to pass, and control the speed of the vehicle more reasonably.
Of course, there is a necessary premise for predicting the time of changing lights at traffic lights by collecting the start and stop time of sample vehicles, that is, the precise positioning function of Beidou navigation, only with accurate positioning and small distance and time errors, this function can be realized. With the precise positioning function, the navigation also has a lane-level navigation function, which knows which lane the vehicle is in, and when encountering a turn, lane change or change of road, the navigation can accurately tell you which lane you need to take.
When the navigation has the ability of accurate positioning, the navigation software can also realize the pedestrian navigation function, the street view map function, the novice navigation function, the bus stop warning function and so on.
To sum up, the "black technology" and tips of navigation not only make travel more convenient and safe, but also bring us many unexpected surprises. Behind the "black technology" is the progress of science and technology, is the strength of the country, in this Spring Festival, let us use these smart tools together, enjoy the beautiful travel experience brought by technology!