Currently, there are three main companies that provide road conditions services, Century Qualcomm, Beida Qianfang (which acquired the original Palm City), and Jiuzhou Lianyu. They provide data to Baidu Maps and Google Maps, which are road condition data application providers. The main model for collecting road conditions is the floating car model, that is, using GPS to record the speed and direction of the floating car, and then calculate the road conditions according to the road matching. Currently the main floating vehicles are provided by cab companies. Other more costly methods of collecting road conditions are ground sensing coils and speed cameras, which are generally in state departments. A relatively more costly method is fixed-point reporting, which means that there are specialized reporting personnel or equipment in fixed places to report road conditions in real time. The traditional method of road condition information detection is to install ground sensing coils, speed radar and video monitoring tools on the main roads in the city, these devices are mainly used to detect the occupancy rate of the road, traffic flow, speed and other traditional road condition information. GPS-based monitoring of road condition information, this approach is mainly dependent on the cab on the GPS, like Guangzhou cab on the GPS terminal, every certain period of time (10s ~ 30s) will be sent to the monitoring center, the information, including the vehicle's location information, and then buy the right to use this information can be. The above is very good, add a point, basically every car has a navigation bar, even if you do not drive a person's phone is equipped with map software, software background will automatically display the current positioning data to the switchboard, the switchboard will be based on the speed of movement of your positioning data to determine the road section of the smooth or congested, we all know that Ali's big data is very impressive, this is also. Don't ask me how I know, I'm the Gaode update map. Cell phones actually have built-in sensors, which acceleration sensors, often be overloaded, then it will be feedback for the vehicle often, brake or start, proved that, at this time, the road is more congested.